Oh honey,
I feel for you. Re dad can you tempt him with custard, mousse, trifle, ice cream, chocolates, basically anything that is high calorie. Have you tried protein drinks?
You must make time for yourself too and keep up your strength. I really can't talk as lost a third of my weight when nursing hubby at home Pallitive care. But you must eat too, and go for a walk, just have time out.
It must be doubly hard for you losing your friend so recently and now dads poor health.
Re towards the end of Dads life, just be there for him, tell him how much he means to you, how you have appreciated all he has done for you. Hold his hand and be there when you can. Do it now, at the end of the day you want to have no regrets
Hope this has helped.
Sending you a virtual hug
Kathy x