Elderly Relatives

I assumes these picture were taken in Los Angeles, because that’s where Thelma Copeland and Wilhelmina Schoeneman lived in the 50’s. I don’t know who the other two people are.

Wilhelmina’s son Carl was married to Thelma’s sister Violet. What does that make them?

I don’t know who the man in the middle is. I see the house number is 2220.