How was Liv their cousin?
Liv is called the sister's cousin, but the relation is never explained, is it? Their mom had one brother, but presumably the crazy serial killer wasn't Liv's dad. No one seemed to know her mother even had a brother. No one was expecting him at the funeral.
There doesn't seem to be a way for them to be first cousins.
They could be third cousins, but then why doesn't Liv know much of anything about the family, including the fact that judas existed at all.