We continue to have issues with this and this last one is probably the end of the 1.5 years of marriage. Is it acceptable for grandparents to take their grand kids on trips and not take step-grandparents? I have 3 and she has 3. Or should I say to my parents, " If steps are not invited then bio kids cannot go". I do not think that is right however wife feels that if everybody cannot go then nobody should go. Her words, "Your mother needs to realize that now that we are married she has 6 grandkids not 3"