Sticky situation

So my brother has gotten into a relationship with someone and planned a pregnancy within 2 months of being together. My brother got hurt and is on workman’s compensation which means he’s having trouble with bills and stuff. His lady has been helping him. She is now 5 months pregnant, has her own business, has bought her house and has alot going for her. She now wants to break up with my brother and get an abortion. My mother and I aren’t upset about them breaking up because life happens but she’s sad about the 5 month old baby. My brother doesn’t really care ( which is sad) what she does since she doesn’t want to be with him anymore but my mom wants to convince her to keep the baby and if she and my bro doesn’t want it that she would take it in and raise it that way they can still be apart of the child’s life one day and the baby doesn’t have to get hurt because of their problems. I think that’s excellent but she is scared that my stepfather may leave her if she tries to do that because he came in and helped raise us 5 kids and feels like now it’s his time. Idk is he wrong and my mom should push her to take the baby or is he right and he shouldn’t have to raise another kid.