Do the above n also try to tap the conversations (audio- video both) to uncover their true faces. Ask ur brothr to take her to restaurants n party n click pics as a proof that she was never threatened. Also ask him to write letters expressing his love to her n his son n post them thru registered post only n keep a record.
Before AB get a protection order for ur family this wud gv u 3 days time to get an AB wenevr warrant is issued.
N contact SIFF members in your area, we dont charge anythng, so u can freely discuss ur case.