"HE says i should give her another chance"
He needs to know that his own chances are dwindling, based on how unhappy you sound.
Time to play this med style
ie (you'll need to tailor it to your own DH's weak spots) think something along these lines....
I am your punto di riferimento, yes ?
Well, she is old, she will die and when that happens you will be ALONE with no female to orbit because I'll be long gone, having lost all respect for you as a man, a lover and a father.
I have a family who miss me and would give much to see their grandchild everyday, who are heartbroken and outraged at the DISGUSTINGLY inhospitable way your family are treating me and the DISGUSTING way you are failing to be man enought to protect and cherish your wife.
So what motivation do I have to stay here, when I can have people who will love, care for and defend me around me all day every day ?
Do you really believe that being loved and respected so little that I am asked to sopportare e basta as a lifestyle, is motivation NOT to take my child and run away from your country, so I can raise him in a loving environment where he learns that a mother's love is consideration and compromise, instead of subjugation and manipulation ?
What is the benefit for me, for my child, to live here with you, as your very last priorities, no matter the sacrifices I make each day, by being so far from home and the people who love me PROPERLY ?
Currently nothing.
And each day my love for you dies a little more. You can revive it, but there is not much time before it becomes a terminal case.
I know you feel pulled down the middle, but I am not the one who decided to play a game of tug of war with your heart and loyalty. I would NEVER had chosen to make it hard for you to enjoy a good realtionshipo with your mother merely for the sake of demonstrating to her how i can flex my muscles. Because I don't see you as a puppet, you are my love, I could never hurt you that way.
And this I can prove, becuase I am the one willing to go, to avoid you being torn in two.
I was not the one who made it case of having to chose. But since she has decided this is the way it must be, well then you have to decide and if you can't, I will, for all our sakes. Because I cannot go on watching all of us exhausted and constantly damaged from dancing to the tune she plays.
_
and other just as heavy hitting "playing MIL at her own game" mix of honesty and "arm waving style" stuff to round it out.
I found writing something like the above in a letter helped, to even up the unlevel language playing field and to give him time to absorb what i was saying rather than just try to brush past it for the sake of winning\getting away from the current row. It can also be reread giving the weight of the message time to be absorbed and understood. It gave him time to think in a heat free context and to face up to the fact that this was not a case of "six of one, half a dozen of another" but a scenario of his mother's making.
And it worked.
You can win this love, but you can't win ONLY with our rules, you have to engage with her communication strategies and his weak spots too.
Go Med Style with extra added Brit Grit. Speak her language when using your cultural strengths and combine the best of both world's to fight your corner.
and a (((big fat hug)))))) cos been there, bought that Tshirt and came very close to strangling both MIL and DH with it.
Oh and keep the letter, so you can batter him over the head with it if when any backsliding takes place. Saves time.