How to legally view messages from the second number?

Recently, a situation arose with my younger brother: he constantly lost important SMS notifications, and we could not agree on a simple notification scheme. I was wondering if there is a way to receive messages sent to his phone so that he doesn't miss family notifications and stay in touch without extra problems.

I had almost the same situation with my sister, I would also like to know more about this, I will wait for advice!

When it comes to the issue of managing communications, it's important to remember, especially when considering how to receive text messages from another phone number, that consent and the law must come first, intercepting someone else's SMS on your own is illegal, but there are legal options for example, setting up message forwarding to your number from their phone with their explicit permission, or using your carrier's family features and parental controls, that way you'll stay informed about important notifications while preserving trust and respecting personal privacy.