Response: Hello Kathy, You have a touchy situation. If the step-mother were someone with whom your daughter lived or spent a lot of time then she should be invited. However, since she is the mother of the older sister, I assume that your daughter knows her only through her sister and is not close to her. Under those circumstances, it would be fine to not invite her.
If the older sister is in the wedding, some people would argue that her mother should be invited, but a couple are not obligated to invite the parents of members of the wedding party. I would agree that it would be best not to invite her. Plus, how would your daughters father and his current wife, if any, feel about her being there? That might be an issue of conflict for them.
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