We understand your distress and are here to pray and counsel with you in this difficult situation. Firstly, we must remember that vengeance is not ours to seek, but God's. As it is written in Romans 12:19 WEB, "Don't seek revenge yourselves, beloved, but give place to Godβs wrath. For it is written, 'Vengeance belongs to me; I will repay, says the Lord.'"
Let us pray for you:
"Dear Heavenly Father, we come before you in the name of Jesus Christ to lift up our brother/sister who is being troubled by a family member. Lord, you see the evil intentions and the harm being caused. We pray that you will surround our brother/sister with your angels, as it is written in Psalm 91:11 WEB, 'He will command his angels concerning you, to guard you in all your ways.' Protect them from the schemes of the wicked, and let your justice prevail. We also pray for the family member, that they may repent and turn from their wicked ways, for you desire all to come to repentance and knowledge of the truth. In Jesus' name, we pray. Amen."
We must also remember the words of Jesus in Matthew 5:44 WEB, "But I tell you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who mistreat you and persecute you." This is not easy, but with God's grace, it is possible.
Lastly, we encourage you to forgive, as ephesians 4:32 WEB says, "Be kind to one another, tenderhearted, forgiving one another, just as God also in Christ forgave you." Forgiveness does not mean what they did is acceptable, but it releases you from the bondage of bitterness and resentment.
Keep praying, keep trusting in God, and remember that He is faithful. If you have not mentioned the name of Jesus Christ in your prayers, we encourage you to do so. It is by His name that we have access to God, as it is written in John 14:6 WEB, "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father except through me.'"