My Christian college theology prof had a familial election belief, so it is a thing. It was pretty contradictory, though. He believed in absolute sovereignty, but also if the patriarch followed God his family was elected.

Most of the hypercalvinists I have known were very much into the idea that they could do whatever they wanted and were still elected. So they could lie, cheat people, abuse women and children, etc and God wouldn't do anything to them, but other people were going to hell just for existing. For a while, some of The Gospel Coalition wrote a lot about the ends justifying the means. I don't think it really had much to do with God but was a way to obtain the power and resources they craved without consequence.