I'll tell your wife that if she thinks she can't handle her life as it is then rather then "punish" your husbands family for wanting to go out child-free for an evening then why don't you ask for help as well instead of being a martyr and while being this martyr, abusing your husband and his good nature?
If you felt neglected that he went then you could have gone with him and had a night together looking after the children which could have been a fun night as a family.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion