[Morrigoon]

I chose 20x30 because it's the largest poster-sized print at Costco. They have an online thing where you can upload your photos, FWIW.

Also, the clusters are multiple photos of the same person (tried to have younger/older when possible), and of course spouses.

Red lines correlate to actual relatives, and blue are not exactly relatives (for example, the line between my grandmother and her first husband, who is not my dad's father, but is my aunt and uncle's father, and the line from him to my aunt & uncle's other half-sibling). Or from my dad to his first marriage and from him to his current wife.

You may also notice (only if you look REALLY closely) that there are light gray lines separating the "generations".

The lines worked pretty well until I got to my ex-sister-in-law's brother, who should be on her generation line, but I dropped him down a level because he married my brother's daughter from his first marriage (making my niece her own ex-aunt-by-marriage or something) and they recently had a child (whose picture I don't have digitized, so he's just a name at the bottom)

My recommendation is start with a HUUUUUGE canvas, keep the pictures relatively small, and keep the file uncompressed because you'll be shifting things around a LOT. Oh, and I started out with a vertical canvas, but figured out fairly quickly that I was going to need to go horizontal. Also if you do clusters, you can always link the layers (each cut and pasted image lands on its own layer) together to move clusters as one, which helps.

Also, lining up generations and putting a clear space between them was very helpful in keeping it organized, even when I'm squishing multiple people's kids together on the lower generation lines, having that space meant the lines of descent are pretty clear, which is really what you want.