One obvious OneWorldTree FUBAR

Lucille Ball is listed as the grandmother of her husband, Desi.

When you look at the details, it inserts someone inbetween them, and all it says is “Living ___” where ___ is a last name that’s irrelevant, but obviously someone had a little fun and said that Lucille was their mother, and Desi their son. It’s kind of like WikiAncestry, but there’s no one correcting the vandals.

That doesn’t disprove anything though.