Stuck up for me massively when mil (who has never liked anyone either of her children have dated according to dp and sil) was a total cunt on our ds's first Christmas. He was under 3mo and I was still very hormonal, mil had bought every bloody present under the sun and was generally making herself awkward, her disapproval of me clear, had no respect for me as ds's mum and left dp and I literally nothing to buy our first born on his first Christmas.
I struggled to hide my upset and suggested some of the biggest things could be kept at mils, things ds is just starting to use now he is 3 and it all ended with mil in tears calling all the names under the sun, everyone in tears and first Christmas ruined.
He really properly drew lines in the sand that the three of us were his number one priority now and he absolutely would not tolerate anyone treating the mother of his child and the woman he loves (his words) with such contempt. She didn't speak to him for months, ignored his birthday and was generally acting like nothing was her fault but dp refused to make contact until she had apologised for her appalling behaviour.
She tried it on a few times after that too but he made it abundantly clear that it wasn't going to cut it and she's reasonably well behaved now.
He also dug up the garden and landscaped it for me so we could have grass and trees and flowers instead of the swamp, complete with frogs, that we had previously.
Of course then there's the odd little things he does too like random presents, cups of coffee, finding stuff he thinks I might like etc.
He's a bit of alright really 