I truly feel for you!! I have been in this weird vortex of quite a few people not saying thank you or acknowledging appreciation towards my gifts, or efforts. My husband and I took his parents, sisters, and their families on a vacation to Florida. We bought flights, rented house, 1 day at Disney, 1 day at Universal. (16 people all together) One of his sisters never said thank you at all, not to him or me. I gave her a baby shower the following year, no 'thank you'. This year I am helping give her a wedding shower, and I'm not expecting a thank you. I have been to a bridal and baby shower and wedding for a cousin of my husbands, not one thank you, verbal or card. Her bridal shower I even gave her beautiful personalized cards in hopes she would use them as thank you notes... no such luck as of yet, it's been a year. Maybe she doesn't know what to do with them? Who knows. I certainly try to teach my kids the power of gratitude and graciousness. Growing up, they were taught, the toy, or money that was received was not to be touched until a thank you was conveyed, whether by phone or in person. I can say this, these people have certainly lost my respect. Hopefully you can see your nephews sometime and go shopping or something special.