Heavenly Father,
We come to You in the Name of Jesus, asking for Your help in this difficult time. We ask that You bring peace to the mind of ###'s father, and help him to find comfort in You during this difficult period. We pray that You would bring reconciliation and understanding between ###'s brother and sister-in-law, and that You would bless them with a long and happy married life. We ask that You would provide the wisdom and guidance they need to work through their differences and to build a strong and loving marriage.
We thank You for Your goodness and mercy, and for the hope that we have in You. In Jesus' Name, Amen.