moving back

hi
I am thinking of moving my ex back in with me . I currently receive sda sdp is ctb hrc hrm. I think that I will lose sdp is and ctb.he does not work or claim any benefits but does have a pension from work. does anyone know what affect it will have on sda (will it speed up transfer to esa).will he also be able to receive carers allowance for me. also if he moves back (he has been living with our son and wife what info do dwp need about where he been living because no bills in his name will letter from son suffice.

many thanks