bislas
i like how the last one you put was Who Do You Think You Are?
But it's an actual show - and that truly is the name of it. It's a TV series that follows various superstars (one per episode) as they go on a genealogy journey to find out more about their ancestors. It's a very fascinating show. Especially when sometimes the information they discover tends to connect with roles they've done themselves (i.e. Matthew Broderick - one of his ancestors served in the Civil War; Matthew played a Civil War soldier in one of this films he acted in).