Having a PhD student is like having a child. I have had many such “children” graduate, and have another two “on the way”. (See here for my offspring.)
Going in the other direction, here is my family tree, compiled from the Mathematics Genealogy Project (MGP). Each person advised the one below them. Hover over a portrait (or tap it) to see who they were.
Many people have two or more advisors, so there are multiple “lines of ascent” (as there are with regular family trees). I am showing two of many …