As regards Kay being a WASP, I reckon WASP is our doing!
also WASP Kay was already Michael's girlfriend, long before Michael having to become the Don and the quest for "legitimacy"

Good point about Apollonia's interest in playing the part of a successful businessman's wife though Kay hosting Senator Geary's wife didn't help Michael in any way

Roth's wife was not at his birthday party in spite of being in Havana She was also sent off to play bingo

The role of the women, at that time were!
1. bringing their sons into this world
2. cooking, cleaning
3. don't give any reason for their husbands to hit them