Please, please, please - stop with the "mum of boys" thing 
They type of mil you are does not depend on the sex of the baby you grow and push out and bring up.
Mils come in all shapes, sizes and temperaments. I've heard of some pretty fucking awful tales from blokes about their mils
. I've also heard some of some beautiful relationships where mils and dils adore each other.
The type of mil you are depends on you (providing of course that you have a semi reasonable, semi normal dil or sil).
I could not have done more to try to help or make welcome my mil over the years. Invited them for meals, Christmas, Boxing Day, new year (very few invites have ever been accepted, and we are seldom invited there). Cooked a weeks worth of meals for them when her father passed away, making sure that all that needed to be done was reheat. I even washed the fucking vegetables and bagged them up. I've driven mil around, picked up parcels for her, helped to clean not only their home repeatedly but also fil's mother's home before her funeral. Visit MIL's mother on a regular basis, in her nursing home whilst she is battling cancer and having just lost her husband, as they can't be bothered (her words, not mine). This is merely from the top of my head - there has been a lot in 14 years. And yet can they be bothered with DH and I? Can they fuck 
Sorry for the hijack op, but I'm so sick of reading that just because a woman has a son, she is automatically cast as a mil from hell. It has nothing to do with being a mil and everything to do with generally being a nice, normal person.