40 Creepy Facts About The Black / Lestrange Family From Harry Potter
The Blacks Scrub Squibs and Muggles from Their Family Tree
It’s already fairly clear that the Black family tree is not as pure as many in the family would have liked it to be. When Harry takes a second to look at it during Order of the Phoenix, it becomes clear that the Blacks have simply scrubbed certain members of their family off of the tree. If any of the Blacks marry a muggle or produce a squib, they’re removed from the tree and everyone pretends they never existed.
It’s a hard thing to take actions that will mean you get disowned. Still, many Blacks ultimately choose that path, as hard as it is.