I can tell you what not to do!!
My MIL spends her time when she is here gathering information about me to take away do she can b!tch about me to the rest of her family/friends. She's even tried to whinge to my own mother about me.
She still thinks her son is a child, even though he is 27 and a father. She and her husband still try to 'parent' him which means they try to tell us what to do with our lives. Sorry, I am a 30 year old woman with a career and family of my own!!
She often says things like 'she(me) makes him spend all this money' etc, when I don't tell him what to do at all.
She is jealous of the relationship I have with my husband and hates it when he does lovely things/spoils me.
Ugh, she is a big hassle in my life at the moment, can you tell??