I haven't actually done mine yet, but part of the reason is that I was wanting to solve the same problem. My plan is to do a large fold out family tree at the front showing only direct lines and use it kind of like a table of contents showing where to find each family. Then, within the album, at the beginning of each family group, have another family tree just showing that piece, probably with members that aren't on the direct line tree. Does that all make sense? Hope that helps.