3D ULTRASOUND at home... sister in law will be there 😣

Anyways, since it was at home I decided to invite my mom and dad and my husband parents so it could be fair. (NOT HIS SISTER) his sister and I have had many arguments before since the day we got pregnant. She always had something negative to say and when  I used to share ultrasounds info with the family she always had to say something negative to take away my moment...... well now my mother in law just called me to verefy the day because she invited her..... and this is why I'm writing this.... what should I do ? Should I stay quit ? What should I do ☹️