Sounds alot like my piece-o-work of a BIL & (eww) SIL.
He is 56 & married a 37 yr old psycho bitch from hell a whopping 10 mos after his wife of 25 years died of cancer. He has 2 teenage boys also. He makes alot of $$$, and met this chiquita online. She is from Argentina & also from $$$, & used to servants, etc. BIL isn't even good looking so you didn't need half a monkey brain to know why she married him.
She's treated the boys like her servants & even drove one out of the house after she threatened to kill him if he "messes this up for her". She has a police record from this. Her own parents basicly pay her to stay away from them b/c her narcissistic temper is unbearable.
Of course these 2 pillars of society bred, and the resulting she-spawn was 2lbs at birth. She's 4 now & has multiple health probs & barely can talk.
The loving parunts constantly fight, including her hitting him- and I once witnessed SIL tell my BIL that he's an old man & she married him only for his $$$. (The shocker of the century). She excludes the teen boys from everything & BIL acts like the boys don't exist. He even has to hide his bank account from her if he pays for anything for them. If he attempts divorce or any action, she threatens him w/ the sprog.
Needless to say, I've lost any respect I ever had for him & don't feel sorry for him. He brought this hell of a life on himself.