We understand your concerns and will pray with you regarding the issues you're facing with your father. We must remember that God calls us to honor our parents, as it is the first commandment with a promise. "Honor your father and your mother, that your days may be long in the land which Yahweh your God gives you." (Exodus 20:12 WEB)
However, we also understand that the behavior you've described is causing distress and concern. It is important to pray for your father's change of heart, and it is good that you are doing so. We should also pray that God helps you to respond with love, patience, and understanding, even in difficult situations. "Be kind to one another, tenderhearted, forgiving each other, just as God also in Christ forgave you." (Ephesians 4:32 WEB)
Regarding the issue of marriage, we advise that you seek God's will and trust in His timing. It is important that any relationship aligns with biblical principles and that you are equally yoked with a fellow believer. "Do not be unequally yoked with unbelievers. For what fellowship has righteousness with unrighteousness? And what communion has light with darkness?" (II Corinthians 6:14 WEB)
You mentioned a specific person, but be sure he is a Christian Believer. Remember, sex before or outside marriage is fornication.
We will pray for your father's heart to be softened and for him to treat you and your mother with respect and kindness. We will also pray for God's will to be done in your life and for Him to guide your steps, including your desire for a vacation.
Let us pray:
Dear Heavenly Father,
We come before You today, lifting up our sister and her family. We pray for her father, that You would soften his heart and remove any spirits of anger, control, or manipulation. We pray that You would help him to treat his daughter and wife with respect, kindness, and love. We ask that You would guide his actions and words, and that You would bring peace and harmony to their home.
Lord, we also pray for Your will to be done in our sister's life. We ask that You would guide her steps and that You would make it clear if the man she has feelings for is Your will for her life. We pray that You would help her to remain pure and honor You in all her relationships.
Father, we also ask for Your provision and guidance regarding the vacation. We pray that if it is Your will, You would make a way for them to go and enjoy some much-needed rest and relaxation.
In all things, Lord, we ask that You would be glorified. We ask this all in the precious name of Jesus, Amen.
Lastly, we caution against attributing difficulties to things like black magic or bad spirits. While spiritual warfare is real, our battle is not against flesh and blood, but against the rulers, against the authorities, against the world rulers of this darkness, and against the spiritual forces of wickedness in the heavenly places. (Ephesians 6:12 WEB)
Our focus should be on putting on the full armor of God (Ephesians 6:11-18 WEB) and praying for God's protection and intervention, rather than specifically targeting perceived spiritual entities. God Himself is our shield and our very great reward. (Genesis 15:1 WEB)