Have you checked that you haven't turned off sounds? Go to Settings/Sounds and haptics, and make sure that you have a tone chosen for texts.
Also ensure that you haven't set the phone to do Not Disturb. Swipe down from the top right, and you'll see a moon icon. Check that this has 'Focus' next to it, rather than Sleep, or DND.
Also, does your husband use an Apple Watch? If so, check that he hasn't set Theatre settings on there that are synched to his phone.
Good luck - it's so frustrating when you can't get out of situations like this.