OP’s sister and her husband have fertility issues and unfortunately aren’t yet able to get pregnant. OP, on the other hand, has two foster children (that are siblings) and is currently pregnant (from a relationship that recently ended). All of this caused OP’s sister to lash out at OP and got to the point where OP snapped back and OP’s mom sided with the sister. Since then OP has been trying to figure out what to do.