My family was wealthy, so our family tree is pretty well documented. We even have pictures going back 1882 iirc.
My mother is the family historian and because of a very rare illness that runs in our family, she has done a lot of research in our genealogy. The family pictures actually helped establish proof that it is a genetic illness.

My family is mainly Dutch descent, reason being we can trace ourselves back to before the creation of Belgium. Everyone is either from the part that is currently still Netherlands, or from the part of Belgium that used to be Netherlands.