I'm invited to a shower my MIL is throwing for her close friend's daughter. The two families have been close for many years although their children do not keep in touch with one another. (Ex: The MOB & FOB were invited to and attended my wedding. MOB was invited but did not attend my bridal shower.) Honestly I don't particularly want to attend, but feel obligated since I was invited. I've met the bride once, about 3-4 years ago. I would have to reintroduce myself to her at her bridal shower, which seems like a red flag to me. My SIL will not be present at the shower, as she has prior plans to be out of town. Is it appropriate to attend a bridal shower for a bride I do not know because it's hosted by my MIL?