I understand your feelings and to an extent maybe your dad's. I think you need to allow him to keep some of his pride and dignity. These have been assaulted and it's harder for an older man than a younger man to have his loved ones see him this way.He needs to not be seen in this state .
My husband told me not to visit him every day when he was expecting to be in hospital for 4 or 5 days for a cancer operation .I did visit every day but some days he was too sick and asked me not to stay long . Because of complications he was there for 2 weeks and he allowed our daughter to visit a couple of times only. Our sons and friends didn't even know he was there.
I am only telling you this to explain how some people feel when struck down by illness.I was in hospital for an operation for 5 days about 15 years ago . Only my husband and work colleagues knew. I didn't want my children to see me like that . It was a pride and dignity issue for me.
Perhaps your dad has a male friend or relative he especially gets on with and who speaks his language who can help. Maybe you can discuss the possibility with a counsellor or hospital staff. Still ,only if your dad agrees.
I hope this helps a little.In time your dad may change his attitude .
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