I think maybe a lot depends on your dad, and how he typically responds to this sort of thing. I know my mom would tell me to go, don’t miss the opportunity (I’m assuming you don’t get the opportunity to travel to the states often). Especially, if she isn’t alone, because other relatives around. My dad I’d have a harder time, but even he I think would want me to go if my mom was with him.
I know a friend of mine would be horrified that I would leave at a time like that if I were her kid, or horrified anyone would ever do such a thing. She is overly clingy in general though with her kids and family in general.
I’m assuming your parents are somewhere in the middle with expectations during emergencies like this, and so that’s what makes it difficult to decide. Can you ask the other relatives and see what they think?
Only you can decide. Do what you won’t have regrets about. Generally, I think not being there for family is more likely to cause the deepest regrets, but it really depends on the situation. Only you know the details of your family and how you will feel.
I’m assuming you have been visiting the hospital since he was admitted?
Can you change your mind in the middle? Is it very costly to change the ticket last minute if you don’t go and decide you wish you were there, or if you do go, and want to fly home early?
Personally, I wouldn’t worry about disappointing your husband too much, because I don’t think this is a situation where he should be putting that type of pressure on you, he should support what you decide to do. I think it’s fine if he offers his opinion and helps you decide, but he shouldn’t be the biggest factor in this decision I don’t think. I understand that even if he is supportive he might still be disappointed. It’s complicated.
I know I wouldn’t worry for a second about cancelling on my husband if I did decide to stay if he is going home to Mexico to visit his family. He’s with his family in his country. Still, in this situation the way I understand it, I’d go on the trip most likely.
Can you postpone the entire trip for January? Do you and your husband have that flexibility?