I was raised to send thank you notes. Actually, the 5 of us were, but I seem to be the only one who continues the tradition. On Christmas, afternoon as a kid, I would have my thank you's written and ready to mail, much to the chagrin of my siblings. I live a good distance from my brothers and sisters and their families and I often have to call to see if a gift was received by my nieces and nephews. I really don't get that, because they are all capable of picking up a phone or sending an email. Heck, I'd be happy if they texted me, if not to thank me at least to let me know they got what I sent!