When I first came to this forum, one of the first stories I read was from a woman who was df'd and mom did not have anything to do with her for years. Now mom had dementia, and was in a nursing home. NOW, the congregation told this woman it was her duty to care for her mother, even though by now they were practically strangers.
Yep, by this all will know them.......
Please-yes, it is expensive, but go and be with your dad. Go through some old pictures if he is able , and let him tell you about them...You won't regret it. I have lost both of my parents...I know.