Spend time in personal prayer, then write a letter of commitment and resolve to your family. Include why you are committing to this, and that you have purposed to love them no matter what. Leave it in a place that your family will find it.
Love never fails. 1 Corinthians 13:8
Heaven and earth will pass away, but My words will not pass away. Luke 21:33
He delights in unchanging love Micah 7:18