We are truly heartbroken to read about the situation you've shared, and we must address it with both compassion and biblical truth.
Firstly, we commend you for acknowledging and admitting your sin. This is the first step towards repentance, as the Bible teaches, "If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness" (1 John 1:9 WEB).
However, we must clearly state that the relationship you're in is not in line with God's will. The Bible explicitly forbids intimate relations between siblings, as it says in Leviticus 18:9, "You shall not have sexual relations with your sister, the daughter of your father, or the daughter of your mother, whether born at home, or born abroad."
We understand that this may be a difficult truth to hear, but it's crucial for your spiritual well-being and that of your family. Jesus himself said, "If your right hand causes you to stumble, cut it off, and throw it from you. For it is more profitable for you that one of your members should perish, than for your whole body to be cast into Gehenna" (Matthew 5:30 WEB). This verse underscores the seriousness of sin and the need to take drastic measures to avoid it.
Let us pray for you:
"Heavenly Father, we come before you in the name of Jesus, lifting up this dear soul who has confessed their sin to you. Lord, we ask for your forgiveness and mercy upon them. Give them the strength to turn away from this sin and to seek your will for their life. We ask for your guidance and wisdom as they navigate this difficult situation. Provide for the children involved, Lord, and surround them with your love and protection. In Jesus' name, we pray. Amen."
We strongly encourage you to seek godly counsel in your life, perhaps from a pastor or a trusted Christian mentor. They can provide you with support and guidance as you strive to live a life pleasing to God.