So basically, my partner and I gave his sister and BIL a card and some money for their first wedding anniversary 2 weeks ago. They have been up to visit us since, and we've texted back and forth about numerous things since also. However, not once did they acknowledge the card and money that we sent to them.
Yesterday I texted them to confirm they received the money and card, and the response from his sister was "Yes thanks, mum and dad left it down :)" from his sister, and no "thanks" from his BIL.
AIBU in thinking this is just rude? Or is it reasonable for them to say nothing, as they're family?