BD
Get face to face advice, your circumstances are too complicated for me to give any real indication of how your benefits would be affected. Do an internet search for "welfare advice" with your postcode, town or county.
At the least I would expect you to lose the SDP as you will no longer be living alone, if he is receiving the State Pension then whilst he can claim CA for you it will not be paid.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
