It sounds to me like you already are a child of the Living God and that Jesus Christ is already your Lord! It is by faith in Him through grace that we are saved, and it sounds like you know Him and love Him, but that you have perhaps fallen into some sin that has dragged you down. But once you know Him and have repented, you are saved eternally. So know that as long as you have faith in Him, you are one of His!
Now to pray: I pray in the name of Jesus Christ, for both Aaron and his wife, that they know You all the days of their life and that you transform their lives, they day by day, they die to their old sin nature, and serve You, Father, as ministers of the Gospel to a dying world.
I pray for all of Aaron's family, that You bless them, and help them, and keep them in your ever-gracious favor. May Aaron be a strong witness to Your saving grace.
Also, Father, put a strong love for the Bible in Aaron's heart, mind, and spirit, so that He may read Your Word daily and study it to be approved and be blessed in the name of Jesus as a man who loves Your Word and lives by its ways.
We thank You, Father, for Aaron and his wife and all that they are about to do for Your kingdom. And for their precious lives as well!
Thank You, Lord Jesus. In Your Holy Name we pray in agreement!