Alma Baldwin and Richard Hillman.

[CAEF]

It was never confirmed that they were first cousins but Richard did say he was Alma's cousin when he arrived at her funeral. Could have been part of his con but if so then how would he know of Alma? One of those unanswered questions but it is still possible they were cousins and Richard used this to worm his way into the lives of Audrey and co. Dickie Hillman and Alma could pass as cousins.

[roverman]

I think it was true.

[CAEF]

I think so as well, otherwise how else would Richard know of Alma? He seemed very clued up on her. I think the exact cousinship was their mothers were sisters.