Relationships can be tough, especially when you have to deal with the lover of a loved one. Trying to drive them apart could end up just driving your loved one away, which seems like it isn’t what you want. Instead, have you tried to talk to them about your feelings?
I understand that you don’t respect her choice to have a child in her teens on religious grounds. At the same time, however, you are choosing not to respect her religious beliefs, which seems a tad on the hypocritical side to me.
Instead of trying to drive her away, maybe your family needs to sit down with your brother and his girlfriend, and have a talk about what kind of behavior is acceptable. Maybe they could lay off telling you and your family what to say or not say, and you could relent a little on the public prayers. That way, you reach a similar compromise.
As for making her go away, I don’t see that you have much to go on. If you want her out of your life, you might have to choose to let go of your brother. Barring that, try to wait it out. Don’t engage if you don’t feel like you can be civil. Maybe he’ll grow out of this phase, but maybe not. You need to decide if you want your relationship with your brother more than you want him not to have a relationship with this girl.
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