Not to beat a dead horse, but ...

My SIL's daughter is getting married (this week, in fact ) and I have booked them 3 nights in Berlin and 2 nights in Paris in November. Reading this thread, I note that, while in-laws are OK, there is no specific mention of cousins.

The res was done in my name, and nothing else was added.

If cousins are OK, I'll just contact either Choice Privileges or the hotel (what would you recommend?) and add their names. If it's not OK, I guess I've just acquired a daughter from a previous marriage.