CONTROLLING MOTHER IN LAW

I need some unbiased advice off people other than my friends and family to clarify that I am not the crazy one here!!!!My on and off partner (who I share a young daughter with) was diagnosed with bipolar at age 39 years old. I have been his rock throughout this whole process and have emotionally supported him when times were extremely tough. He also has a daughter from a previous relationship whom he is not allowed access to unless his mother is there (his mums rules not his). She often takes his daughter away from him without question treats him like an unwell human and uses his diagnosis against him. She has an unhealthy relationship with his daughter who is only 6 years old ie she puts her in a pram, gives her warm milk in bottles, sleeps in her bed with her and allows her a dummy. The father always said “mum she’s too old for a pram she looks ridiculous” and she would just laugh it off and say it was ok.She told me my child was a mistake and that “crazy people make you crazy” (referencing his son had made me crazy and I was mad for not aborting my unborn child).To cut a long story short, his mother is controlling and has gone to the ends length to get his daughter every second weekend...She left this note to him on the kitchen bench and I happened to read it... it is a note outlining what THE FATHER OF MY CHILD CAN AND CANNOT DO REGARDING OUR CHILD!!!I’m devastated and appalled and am at a loss. Please help!!!Ps How do I add the image of the note??? via /r/Parenting https://ift.tt/3iohClD