His sister is becoming a problem

So me and my Husband has been going through a rough patch since the death of his mother five months ago and to top it off I'm 5 months pregnant on Mother's Day we got into a huge fight where he called his sister  like he always does and tells her what he wants to tell her. When u tried to call his sister to explain my side of the story she threatened me, my mom and my unborn child. When I explained to him his sister is wrong he didn't wanna here it! I told him I don't my daughter or my baby around her who threatens someone's unborn child. He gets mad and doesn't wanna hear it. Plus his sister is always throwing our money and relationships issues on Facebook plus in my face. I'm like we wouldn't have that issue if we weren't helping her out! Plus always asking my husband for rides like he's a taxi service in my car that I'm paying for! I just feel like she needs to get a life and let us deal with our relationship. Her brother is not her MAN!😡😤