Grizz, sorry that you are in this situation. Agree with the other posts here. As hard as it may be, I think you know what the right choice is. IMHO you can never go wrong with being supportive of family - even if S is currently masquerading as an alien.
Me-48,W-51 M-22,T-24 S- 18,16,9 Feb-Jul '11 Away from Home, after initial B date Aug-Dec '11 Back at Home on couch Dec '11-now Same bedroom, room mates only Dec '14 W files initial D paperwork