DEAR ABBY: My parents have been divorced for 15 years. Dad is remarried; my mother lives alone. My brother and I alternate holidays every year, and this year he was supposed to host our mother. Instead, he just informed me he has decided to invite our father and his wife to dinner, leaving our mother no place to go. I would love to invite her to my in-laws’ house, but my husband doesn’t want her to come. When I told him he could take the kids to his family’s house, he got very upset and told me I should consider ...