If your brother sins against you, go and tell him his fault, between you and him alone. If he listens to you, you have gained your brother. - Matthew 18:15
Everyone should be quick to listen, slow to speak and slow to become angry. - James 1:19
"Do not provoke your children to anger, but bring them up in the discipline and instruction of the Lord." - Ephesians 6:4
It doesn't matter if they apologized. Forgive them anyways.