Back again, I'm hoping you can work your magics again on another one.
Late teen early 20's guy, think his father has passed and left him a huge fortune. He lives in an apartment building, has a lot of friends who come with him..
Meeting his father's family he realises they are a group/ society (all rich) who are thruples or couples with a "third".
Used to think it was a Jay Cantrell story but it's not.
Does it ring any bells for people?