Sorry, but it seems like every month or two, MissB has home issues. I'm writing this to catch up on BOTH of her issues.
OK, sorry but it seems I'm a bit late to this, but I'm going to put in my two cents either way.
After seeing numerous posts about how bad things are at home, between the SO and the "in-law", I think many people here are trying to tell you the same thing. If you are upset about how your SO and "in-law" are treating you, maybe its time to move on. I know you say you love him, but thats only half the battle. He still needs to love you back. If he won't commit, he lies to you, his mother beats you up emotionally, you work your ass off FOR BOTH OF THEM and nobody appreciates you, then maybe you need to find yourself a new life.
You're a pretty girl, responsible, caring for your family, and have a job. You try to keep a clean house, support your SO (both financially and emotionally), and if I remember correctly you try to take care of yourself (nice job BTW). If you think for 1 minute you'll have problems finding someone that will care for you and RECIPROCATE what you give them, you're crazier than you come off in some of the forums.
The bigger concern here, on all of the things that have been bugging you about your home life, is the concern for your child. The "in-law" treats your kid like crap and that is UNACCEPTABLE. Your child is her flesh and blood, the child of her child, and if she has a problem with that then the bitch has to go. If your SO doesn't have the nuts to have your back on this one, he can move his shit while he's moving hers. Your child is an innocent bystander in this dysfunctional BS and it needs to stop. For your sake and your kid's. Your kid cannot live in a house like this. Your kid will learn to disrespect you just like they are, lie to you just like they do. You think things are hard now? Try dealing with teenagers that treat you like they do, 4 people beating you down emotionally each and every day.
You can't change her, and, quite frankly, good luck changing him. She needs to be shipped out. Not in a home per say, but possibly assisted living. She gets to retain her freedom, but has others to assist if needed. Either way, the well being of you and your child needs to be first in your mind. I know you don't ask the SO to stand up for you, but it blows my mind he doesn't do it of his own free will. I would NEVER let my mother talk to my wife the way she talks to you.
He buys the laptop, he can use it to find a new place to live.
She complains the house is always messy, Start by packing her shit.
If they continue to Lie, they can keep lying by telling people they still live with you.
Get a grip, for you and your kid. Bad situations breed bad situations.
*Again, sorry to all for combining an old post with a new one, but someone needs to point out there is a trend here and it needs to stop.*