This is probably going to sound negative but it's what I feel:
I agree that Bravo probably set up the whole Sonja/Aviva dad thing but it's perfectly understandable.
I really like Sonja but she's pretty transparent....I'm not so sure that she married Mr. Morgan, twenty years older than her, strictly for love. And I don't have a problem with that. Not everyone marries for love alone.
Sonja is constantly reminding everyone and anyone how sexual she is...the way she dresses, or rather un-dresses, the constant flirting w/anything male, etc. etc.
I've read that she never wears underpants, rarely a bra and is constantly "flashing - a la Sharon Stone" anyone in the vicinity...that the husbands are used to it, etc etc.
So given these two presumptions in my mind, Aviva's husband was a perfect choice for Sonja.
To me, she seems needy and insecure and I think she needs a man with wealth/power and that her place in society is dangerously slipping.
I imagine it would be difficult to go from being Mrs J P Morgan to Mrs Nobody with No Money. And age is creeping up on her.