Ya, that's my fear, that blood will always be thicker than water. Having said that, he has a history against his family, too. He's told them about the financial piece and being a compulsive liar.

I did speak to his mom a while back, regarding another incident about her husband. I did leak out a bit about some of my partner's behaviours related to the incident. We had a great conversation and she, too, said the same. She said I'm family to her and she "knows her boys well". But I don't want to involve her further because she's mom and it'll hurt her most.

I've debated about sending sister an email, and keep it for my own records, but she may just believe otherwise.