I am having three bridal showers for my wedding. My mom and mother-in-law are invited to all of them (they insisted!) and also insisted on buying gifts for each one, even though I told them not to because they are paying for the wedding. My question is, do I write a thank-you note for each shower gift? We are giving them nice parent gifts at the rehearsal dinner - should I wait and do one big thank you then, or write one for each gift? Thanks!