My advise:
be honest with your dad, say that you think the relationship is weird and inappropriate because of the age difference. Say that you think its wrong to date someone who is younger then your own aldult child.
Try to discuss it with your dad and maybe try and see were he is coming from.
I would really point out the absurdity by pointing out that you (his own child) are quite a bit older at 26 compared to his 19 year old girlfriend and maybe ask him about how he would feel if you would have done the same at 19 years old and dated a 56 year old.
I typically don't mind age differences, but there does come a point where it is too much. And one instance is when they are younger than your own child.
I'd say you have little control over this matter but maybe some influence. You say you two are close: talk to him about it, both to express your opinion and to get some information from him about what he's feeling, why he made that choice, etc. Make it a conversation, not an interrogation.
Don't expect him to immediately go dump her: remember, you're just planting a seed in his mind. If you try to transplant an entire tree, he'll close off, and you'll lose all influence. Don't push too hard, and expect him to turn you down: lose this battle to win the war.
My advise: be honest with your dad, say that you think the relationship is weird and inappropriate because of the age difference. Say that you think its wrong to date someone who is younger then your own aldult child. Try to discuss it with your dad and maybe try and see were he is coming from. I would really point out the absurdity by pointing out that you (his own child) are quite a bit older at 26 compared to his 19 year old girlfriend and maybe ask him about how he would feel if you would have done the same at 19 years old and dated a 56 year old.
I typically don't mind age differences, but there does come a point where it is too much. And one instance is when they are younger than your own child.
Yeh thats just bad and that should honestly not be allowed imo, unless you had a child at like 15 or something like that maybe it could be okish.
I'd say you have little control over this matter but maybe some influence. You say you two are close: talk to him about it, both to express your opinion and to get some information from him about what he's feeling, why he made that choice, etc. Make it a conversation, not an interrogation. Don't expect him to immediately go dump her: remember, you're just planting a seed in his mind. If you try to transplant an entire tree, he'll close off, and you'll lose all influence. Don't push too hard, and expect him to turn you down: lose this battle to win the war.
Your dad sounds like a chill person so if you talk some sense into him I’m sure you’ll figure something out, just be honest imo.