Assuming they’re old enough to have a phone, obviously.
I have to send my daughter reminders to do things all the time because she’s extremely forgetful. She’s not annoyed by that, she’s asked me to do it. And whenever I send her one, I get a read receipt and no reply. And I’ve told her a bunch of times that it’s rude to not reply to texts like that, but she keeps doing it.
It’s driving me crazy. She’s a good kid, but why doesn’t she return texts?!
I just send my kid the same text some time later, depending on importance. 1/2 an hour or an hour later, same text. Another unit of time, same text. It usually doesn’t take many to get some type of response.