Ask ten genealogists to draw your family tree and you'll get ten different pictures. Not because they disagree about your family — because "family tree" isn't one shape. It's at least three, and they answer completely different questions.
Pick the wrong one and you'll spend an afternoon fighting the layout. Pick the right one and the chart practically draws itself.
The three shapes
Almost every family chart ever printed is one of these, or a variation on one.
The ancestor chart points backward. You're at the root, and it grows into the past: parents, grandparents, great-grandparents, widening as it goes.
The descendant chart points forward. One person or couple sits at the top, and everyone who came after them fans out below.
The bow-tie points both directions at once. One person in the middle, ancestors streaming out one side, descendants out the other.
That's it. Everything else — fan charts, pedigree boxes, hourglass charts, drop-line diagrams — is one of those three wearing different clothes.
The ancestor chart
Also called a pedigree chart, and it's the one most people picture when they hear "family tree."
You sit at the left edge or the center. Your father's line runs one way, your mother's the other. Each generation back doubles: two parents, four grandparents, eight great-grandparents, sixteen after that.
The defining trait of an ancestor chart is that it is mathematically predictable. Every person has exactly two biological parents, so the shape is known before you fill in a single name. A six-generation ancestor chart has exactly 126 slots whether you're descended from Norwegian farmers or Sicilian fishermen. That predictability is why ancestor charts print so cleanly — a designer can lay out the frame in advance and let the names fall into it.
It's also why blanks are so conspicuous. On a descendant chart, a missing person just isn't there. On an ancestor chart, a missing person is an empty box with a shape around it, sitting between two people you do know. Ancestor charts are honest about what you haven't found yet, which some people find motivating and others find like being graded.
Common variations:
- Box pedigree — the classic left-to-right ladder of rectangles. Great for a binder, awkward past four or five generations because the page has to keep doubling in height.
- Fan chart — the same data bent into an arc, so each generation is a ring instead of a column. Fixes the doubling problem elegantly, because a ring has more room the further out it goes. More on why genealogists love these.
- Circular or "wheel" chart — a fan chart taken all the way around to 360°. Beautiful, but it forces half the names upside down.
Use an ancestor chart when the question is where do I come from. It's the shape for documenting a line, for showing someone their own origins, and for a wall.
The descendant chart
Flip the arrow. Start with one couple — usually the earliest confirmed ancestor in a surname line, or the immigrant generation — and draw everyone who came after.
The defining trait here is that it is completely unpredictable. A couple might have one child or twelve. One branch dies out in a generation; another produces forty living cousins in the Midwest. There's no frame to lay out in advance, because the shape is whatever your family actually did.
That makes descendant charts fantastic for one purpose and miserable for another. They're fantastic at showing relationships across a living family — this is the chart that finally explains what a second cousin once removed is, because you can point at it. They're miserable to fit on a page, because they grow sideways without limit. A five-generation descendant chart of a large family can run to hundreds of people and yards of paper.
Common variations:
- Indented outline — the text version. Each generation indents one level. Ugly, but it fits any number of people and it's how most genealogy software exports a full descendancy.
- Box drop chart — the visual version, generations stacked in rows. Looks like an org chart.
- Descendant fan — the arc treatment again, which helps but can't fully solve the width problem, because unlike ancestors, descendants don't distribute evenly around the ring.
Use a descendant chart when the question is how are all these people related to each other. This is the reunion chart, the surname-project chart, the one you bring when the whole extended family is in the room. More on running that gathering.
The bow-tie
Also called an hourglass chart. One person in the center; ancestors expand out one direction, descendants the other.
This is the shape that answers who am I, in both directions — and it's the one most people actually want when they say "show me our family tree," even though it's the least common in print. It puts a living person in the middle of a story with a past and a future attached, rather than at the end of a line.
It's also the hardest to lay out well, which is why you see it least. You're combining a predictable widening structure with an unpredictable one and asking them to share a page in balance. Do it badly and you get a chart that's precise on the left and a tangle on the right.
Use a bow-tie when the point is a person rather than a lineage — a milestone birthday, a memorial, or the chart that hangs in the hallway with your grandmother at the middle of it.
Which shape answers your question
| If you're trying to... | Use |
|---|---|
| Document a single line back to an immigrant ancestor | Ancestor chart |
| Show someone their own origins | Ancestor chart, ideally as a fan |
| Explain how a room full of cousins connects | Descendant chart |
| Print something for a reunion | Descendant chart |
| Celebrate one living person | Bow-tie |
| Fit the most names into the least wall space | Fan chart (ancestor) |
| Show the family to someone who isn't into genealogy | Bow-tie or fan |
That last row is worth sitting with. Most charts are made by researchers, for researchers, and they're optimized for completeness. But the person you most want to show it to is usually the one who has never opened a genealogy program in their life — and for them, the shape matters more than the data does. More on that gap.
Where every printed chart breaks down
All three shapes share one limitation: someone had to decide who goes in the middle.
A printed ancestor chart is your chart. Your sister-in-law appears on it, if at all, as a name attached to your brother. Her own four grandparents aren't there. Neither are her great-grandparents, or the village they left. To give her a chart, you print a second one.
That's not a flaw in the drawing. It's inherent to a fixed image. One chart, one center, one perspective — and every other person in the room is a spectator to someone else's story.
The shape stopped being fixed
This is the part that has genuinely changed in the last few years.
When a family tree is displayed rather than printed — on a screen you can move through — the center isn't a decision anyone has to make in advance. Any person on the chart can become the middle of it, with the whole tree reorienting around them: their ancestors, their generations, their story. Choose your mother-in-law and the chart is hers. Choose her father and it happens again.
The three shapes still exist; you're just no longer choosing one forever. A tree can be an ancestor fan for the first ten minutes and a bow-tie around a different person for the next ten, because the shape is now a view rather than a printing decision.
At Bright Branches we ended up building five of them — a fan, bow-tie pods, an organic tree, a grid, and a clock face — for exactly this reason. Not because five is a magic number, but because the same family reads differently in each one, and the family in the room usually has an opinion about which they like.
Print still matters, and a fan chart in a frame is still the best genealogy object there is. But it should be the thing you print after you've explored, not the only way anyone gets to see it.
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