BBU
I think your DS needs to be humbled. That is what helped our son in the program he attended - his words. I am not sure how you can instill this in him.
You need to continually remind him that this is YOUR house and he is there as a guest to help him get on his feet to be on his own - which is what we tell our son when he gets entitled acting.
I think it's good he is moving out. I hope he can manage so that he can stay out. Maybe this will humble him...who knows.
Keep us posted on your wife's health. I found out yesterday that a man I worked with for many years who just retired (he's 58) was diagnosed with cancer and has literally weeks to live. I am not sure what his symptoms even were but I am still in shock. Life can be cruel at times.