Emotional abuse

I’ve been with my husband for six years (married for one together for two) since 2018 we had our son in 2022 and live with a relative of my husbands (his nana) who is retired and helps us watch our son while we work. However it’s become clear she thinks she’s raising our son and doing everything for him and that I’m a piece of shit and that I’m fat lazy and so much more. On a daily basis she berates me in front of my child yells at me and tells me she would love to plant her hand right on my mouth . She Doesn’t listen to me when I tell her how i am raising my son and that i want her to stop letting him watch tv all day and that he should be learning to speak instead of laying on the floor watching tv all day. She tells me it’s her tv and her tablet and I respond with hes my son and she huffs and says how he’s going to hate me when he’s older and that im a big bitch and that i like to see my son suffer. I can’t afford to move but I can’t stand the abuse I take from her I wish I had somewhere to move that was affordable or even family that had the spare room but as far as I’ve seen no one does. I’m stuck in hell with my son and husband with no way out my husband defends me every chance he can but she tends to say things to me when she’s knows we’re alone just so when i tell my husband what she says she claims that wasn’t what she said and that I need to open my ears and shut my fucking mouth. We don’t know where to go or what options there are for us when I look for programs to help it’s all DV and I don’t believe those resources are for me but I’m absolutely desperate I work my ass off so does my husband to feed not only our family but his nana as well and she is just ungrateful and complained that she pays for everything even though we pay her rent and for a storage unit her phone bill ect. I don’t know what to do my family is aware of the situation and knows it’s not healthy to stay here but my husbands side other than his mom all act just as nana does and I’m at a loss I’m struggling to hold back everything is overwhelming for me and my husband listens to every concern I have but we haven’t found a solution that doesn’t involve moving to a place we can’t afford (we make to much for low income housing but not enough to make rent)

What should I do what can I do it’s his nanas house not ours and I’m running out of every emotion I have.