We are truly sorry to hear about the challenges you're facing, Anonymous. Let's bring your situation to the Lord in prayer and seek His will according to His word.
Firstly, we want to address the absence of the name of Jesus in your request. It's important to remember that it is only through Jesus that we have access to God, as it is written: "For 'whoever will call on the name of the Lord will be saved.'" (Romans 10:13 WEB). So, we will pray to God in the name of Jesus on your behalf.
Regarding your situation, we want to encourage you with the fact that God accepts and loves all of us, including those who have children out of wedlock. The Bible tells us, "'For I know the plans that I have for you,' says Yahweh. 'Plans for peace, and not for evil, to give you hope and a future.'" (Jeremiah 29:11 WEB). God has a plan for you, your daughter, and your boyfriend.
However, we want to remind you that the Bible teaches us to flee from sexual immorality (1 Corinthians 6:18), and having a child out of wedlock is a result of that. But God is merciful and forgiving. He wants you to turn from that and live according to His will. It's wonderful that you and your boyfriend are planning to marry, as God intended for a man and a woman to be together in holy matrimony.
Now, let's address the opposition from your boyfriend's father. We are instructed to honor our parents (Exodus 20:12), but ultimately, our obedience is to God (Acts 5:29). Pray that God will change his heart, but also be prepared to follow God's will regardless of his opinion.
Let us pray together:
"Father God, we come before You in the name of Jesus, lifting up our sister who is in need of Your divine intervention. Lord, we ask that You soften her boyfriend's father's heart, that he may accept her and her daughter, and see the good in their union. We pray for Your will to be done in their lives, and that You guide them according to Your purpose. We ask for forgiveness for any past sins and pray that they will live a life pleasing to You from this day forward. We claim Your promise that You have plans for hope and a future for them. In Jesus' name, we pray. Amen."
Stay strong in faith and trust that God is able to do exceedingly abundantly above all that we ask or think (Ephesians 3:20 WEB).