After staying with the mother in law for two and a half weeks and saying nothing despite the constant digs ( with occassional days off in between when we went sightseeing- and I had to do all the driving - more stress!) my patience level was zero. I only had to make it another hour or so before we got on the plane but I didn't make it.
The shrew was back seat driving. I got in the wrong lane on the way to the airport (unfamiliar with the roads etc) and she just kept back seat driving.
I lost it "WILL YOU FUCKING WELL SHUT UP AND LET ME DRIVE".  It didn't stop her! She just turned down the volume, but I have good hearing.
We got to the airport, I was still angry with her and she was still furious with me. I did appologise for swearing at her- she didn't accept my appology. She waited a little while longer and then while I was sitting down she stood over me holding my three month old daughter and she let me have it.
She accused me of being rude to her and her family. Rude - well I think they wrote the book on that! Ok I swore at her but boy was I provoked and I did appologise.  Her attack was planned and premeditated and very personal. She has made it very difficult for me to go there ever again.
According to her I am the reason that one of her other daughter in laws did not come to dinner. Funny but I thought SIL was avoiding the shrew long before I came on the scene! You should hear the shrew talk about that daughter in law. In fact you should hear her talk about her other daughter in law to be. She doesn't have a nice word to say about any of us!
Is it just me or maybe she is jelous of all her sons partners.
She really went to town on me. My husband waited until she was finished and then he told her it was uncalled for. Gee thanks. Why didn't you say anything the other times you heard her being rude to me?
Given your sit back and let it happen attitude you have demonstrated to your family that they can be as rude as they like to me and that's ok with you.
And you think we are going back there in 15 -18 months time. Not unless I am on tranquilizers. I don't want to go anywhere near your family ( your mother and brothers- the rest of the family is ok) ever again!
I don't want to stop you seeing your family (though why you would want to I don't know!) and I am not going to stop our daughter from seeing them either but I really don't think that it can be positive for our child to see her mother being treated in that way.
You will have to take her to see them without me. Difficult given her age and the fact that they live thousands of kilometers away. Maybe the shrew should have thought of that first!
If I ever find out that the shrew has been slagging me off in front of our daughter I really will put my foot down. I am sure she is slagging me of to all and sundry now (well here I am slagging her off too- annonomously and not likely to be read by anyone that knows her).

Dreading the next time she rings to speak to my husband. I have promised myself that I will be polite but not say much other than "I'll just get him" or "He will be home at 4 oclock, I'll tell him you called". No point in sinking to her level and the less I say the less satisfying it will be to her. Don't bite back, don't bite back, don't bite back. - My new mantra.
I am proud to say that at the airport after her vicious attack I simply told my husband I would be waiting in the departure lounge. When they brought my daughter to be breastfed I fed her and then offered her back to her grandmother so she could have a cuddle before we borded the plane. Despite the constant digs while we were there I went out of my way for my husband and my daughters sake to give the shrew time with both my husband and my daughter. I did not bite back either.
My husband later told me he was proud of how I had handled the situation - except for swearing at his mother of course but he does agree she was back seat driving.
I am still angry at him for not standing up for me. I need to get over that or it will affect my marriage and I would hate to give the shrew the satisfaction of damaging our marriage. then evil really would triumph..
Rant over for now.