Is there any recent case law that supports our position that s/s should be reduced or better yet terminated?

I am a paralegal and I am doing a trial brief for a client whose wife is getting s/s $683 and c/s $2285. The wife is now living with her female lover. They share the same room and same bed according to the children. They were married 13 years. She stayed at home and had two sets of twins who are 11 and 13. She has done nothing to become employed in the 2.5 years. She has collected s/s.