We just started getting our response cards back. On each response card, we indicated the # of people the invitation was for (for example, ___ of 2 attending). We invited my FI's cousin and her husband explicitly on the envelopes (invite was addressed to Mr. & Mrs. FI's Cousin), yet when we got their response card back, they'd written in that FI's cousin was coming and bringing her teenage daughter, instead of her husband.
We're fine with her bringing their daughter (our wedding is at a winery, so it's not really a kid-friendly venue, but I suppose a teenager will be fine!). However, should we call and offer an additional seat for her husband, in case they felt constrained by the two seats they were given on the response card? Though we're trying to keep the wedding relatively intimate, we have the space for her husband, if he'd like to come.
Anyone been in this situation before? What do you think we should do?