If his family doesn’t love you, or visa versa, you’re doomed
It makes life a little difficult if your family resists your partner, or your partner’s resists you, but honestly: that’s the nature of family! Consider yourself a real member of your spouse’s family if they feel comfortable enough with you to argue with you. Family members can’t stand each other! That’s normal. So long as you, your spouse and the family you create together love each other, you’ll be fine.