Without knowing any details of the "situation" it's difficult for anyone to provide suggestions for a resolution.
However if it's simply a matter of them not liking one another overall then you pretty much made your choice when you decided to marry your husband. Ultimately he and any children you have with him are your "immediate family" now. Very few people would choose to divorce a spouse they love simply because their father dislikes him.
If this were the other way around with a husband caught between his wife and his mother the vast majority of people would say he should side with his wife.
Life is a (personal) journey.
Each of us gets to (choose) our own friends, lovers, and spouse.
We had no say who are parents would be.
Ideally your father and husband could set aside their differences and be cordial to one another whenever they have to be in the same place. If they can't reach an agreement to do that you may have to plan on visiting your dad alone.
You can't make two people like one another!
Relax and (let them) resolve their issues.