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?!
They probably don’t mean to. Reminder texts help a lot. If you have an iPhone you can also just react to your own message to throw another notification at them.