am i wrong?

so I've been with my sons father for a little over 2 years since August/2015 since then I've had a rollercoaster ride relationship with his mother, she's extremely possessive & manipulative. I loss twins last year & my bf and I decided to get them cremated that way they will always be with us. well after the memorial service I couldn't take the thought of seeing my baby's Urns. so she offered to take them to her house until I was strong enough to get them.. well 3 weeks later I'm riding in the car with my son's father & he had his mother on speaker phone & he tells her that he's with me & she says, "aw you ain't had enough of that yet?" which pissed me tf off like bitch what I thought we were just cool.. so anyways I ended up asking for their Urns & she gave me one & said she felt she needed one for her son.. so I made my boyfriend go get the other twin's urn & he did. but I swore I would never speak with her for trying to play me with my dead baby's. fast forward I gave birth to a son back in August & she witnessed the birth along with my mom.. everything was fine until my sons father had some lil hoe call me being very disrespectful.. & I told him & his mother I didn't feel comfortable bringing my baby around them when he has this girl threatening me. she said okay she understands she only wants me & my son Tre to be & stay safe..3 days go by & she's my sister at a bar & is completely bashing me, then ended up calling my mom & going off on her about me? I recently invited her to the baby's baptism & she came with the stankest attitude.. am I wrong for not wanting her to be around my baby anymore? I just don't want negative people around him anyone that doesn't care for his mother couldn't care for him.. she's also spoken about taking me to court for custody over my son.. what do you all think?