dusters - with regards to Mrs X, over the years as I've gotten to know her, it's become pretty clear that she married him to stay in this country. Then again, she's also told me that he only agreed to marry her because she threatened to take their then only months old DD out of this country and he'd never see her again (which, if that had happened, he wouldn't have - he's never shown the slightest inclination to make any sort of effort towards maintaining contact with any child whose mother walked away from him). Mrs X wanted to be 'Mrs [X]', so she was prepared to put up with a lot.
Although she did also seek my advice on how to deal with X's parents, when her DD was about 18 months old. They were undermining her constantly as her child's mother, and she didn't like it... but she didn't know how to stand up to them (she grew up in a culture where you respect your elders completely). I remember telling her that she had to remember that she was her child's mother, not X's mother - and that a firm "please don't ever talk to me like that again" worked wonders. X's parents and I've had our share of run-ins over the years (I've known X since we were 11), but they worked out very quickly that I'll only be pushed so far... then I dig my heels in and become an immoveable force. Mrs X is more compliant than I have ever been, so... yeah; it's possible that she's turning a blind eye to X's dismal treatment of my DC.
The only reason I have ever facilitated a relationship between DS and his father's family is because DS wants (possibly wanted, now) there to be one. X has no PR, his name isn't on DS' birth certificate, and we have no court order. He also doesn't pay any maintenance whatsoever. DS knows that if he doesn't want to see his father/extended family then... I'm going to support him in that choice. Just as I support him in seeing them, for as long as he wants to. But really, none of them are particularly nice people. DS' grandparents injured him very badly a few years ago and didn't even attempt to (a) seek medical help for him, or (b) contact me so that I could do so. They returned him to me, blood still dripping from his forehead, several hours later, and then couldn't understand why I spectacularly lost my shit at/with them (not in front of DS, I hasten to add, as my DD - who is trained in first aid - had hurried him inside to clean him up). DS ended up in hospital as a result of their negligence and they didn't see him for almost two months. But that brought home to me one thing - X is very like his father, and Mrs X is very like his mother.
I wasn't "good enough" for X, in their eyes, because of DD - or so they said. Now, in hindsight, I wonder if it's because they knew I wasn't frightened of them and have always been more than happy to stand up to their bullying ways. Their two sons married women from other cultures, where the husband and his parents expect to be respected before the wife/her parents, whilst their daughter married a man who waves so many red flags that he might as well be a signalman. Even the next generation are being trained to be like this - my DS' youngest sibling, a boy, is treated as though he's a little king... and often at the expense of his older sister (who really is a sweetheart, and she genuinely adores my DC). It's the same with their cousins. It makes me feel very sad and incredibly worried for them, though. Because they're teaching their daughters that they're worth less than their brothers are.
I've always raised both of my DC to know that - as long as they do their very best - they can both conquer the world. As I said before, my DD has quite serious MH issues - and I've wondered for years if part of it stems from not only X's rejection of her, but also her own biological "father"'s (to the best of my knowledge, he's not set eyes on her since she was a newborn). Then again, the man she calls "Dad" and the man who helped actually create her are both absolute tossers. I'm absolutely determined that my DS won't be, if I have any say in the matter!