DEAR ABBY : I have a special-needs son and cannot travel with him alone. I have also been in a committed relationship for two years. When my aunt’s youngest daughter got married last year, I clearly stated that I would not be able to attend because of these limitations. Now her son is getting married. The family sent out an electronic invitation and asked for a plus-one. Since my son will be with my parents during the wedding, I filled it out with my name and my partner’s name. I was recently