The Children were there before you were.
They are in this world because of him.
Be a class act, don't throw a pity party, and encourage your husband to go.
Be the Adult.
And teach them to divide and conquer based on their own whims and wants instead of what is right...
Let them, as adults, think they have as much say as your partner and spouse...
Please....the adult child her acted more child than adult and I would be horrified if my children, regardless of age, behaved this disrespectfully to their father AND his wife...
I am also fairly certain that these same children expected their father's household income, which included the new wife's contributions, to pay for college, the wedding, guilt gifts etc.
This woman behaved like a spoiled brat...she is starting a new life with a man but still wants to effect his father's life in such a way that it causes a wedge with the new wife and he will suffer in old age partnerless...yeah...real classy