Last month, FI and I sent a birthday gift to his six year old nephew. Three weeks have passed, and we have neither heard from the family nor received a thank you/acknowledgement of any kind. On the child's birthday, we called and spoke with him and and his parents, and let the parents know that his gift should be delivered the next day. The tracking website says the gift was delivered on time.
I side-eye not receiving a thank you, especially if a child is involved. I hate parents who do not teach their children etiquette.
On a side note, when we called SIL the week before nephew's birthday to ask what toys nephew is currently interested in, she said to just send cash because the child is "saving up" for a nearly $400 Lego set. Sorry, but unless you're graduating high school or college (not kindergarten!), FI and I are not giving you a cash gift. And, asking relatives to send cash to your child? Seriously?
How would you ladies address this situation? No birthday gift next year? Card only next year? Address the parents? We live in different states, so all interaction is by phone.