I need some serious help haha I exclusively breast feed my son. I'm back home for my husbands…

I need some serious help haha I exclusively breast feed my son. I'm back home for my husbands deployment so now I have family here who want to watch him but pumping milk isn't the issue. He refuses refuses to take a bottle! He's been drinking water out of a sippy cup so my mom tried putting the milk in there and he didn't want anything to do with it. And also he has 7 teeth and is biting my nipples like crazy I need some advice 😱😭