Trust me when I say my MIL is a nasty old cow who has made dig after dig to me over the years, and is really just so mean to DH. I have never said anything back though I keep saying that 'next time' I will -then wimp out every time next time comes.
Anyway, she clearly favours BIL over DH, everyone knows it, and she is really cruel about it.
The other day she put on facebook a picture of her and BIL with the caption 'me and my favourite son' which wouldn't be so offensive if it wasn't for all the background history and blatant favouring of BIL, and it wound me up so much that I have just put up as my facebook status that 'DS enjoyed making cakes with his favourite grandma (my DM) today'. So immature but HA it feels so good! (MIL never visits DS anyway). Preparing for a lynching!