What will we be allowed to keep for our son? What will the nursing home be able to legally take for his father's care?

My ex-husband had another stroke and has been placed in a local nursing home. We are beginning our third month, and I need to prepare for a more extended stay of six more months or longer - That is a guess on my part. He currently receives a disabled social security check and a small miner's pension. He also has a checking account, several life insurances, and owns his home. Our twenty-two-year-old son is listed jointly on the checking account, is the beneficiary on all the life insurances, and is also on the house's deed. I have the Power of Attorney on both medical and financial decisions. What are my options concerning retaining as much of his assets for our son as possible?