We are truly sorry to hear about your dad's suffering. We will pray for his healing and comfort. Firstly, we would like to discuss one aspect of your prayer. It appears that you included God, Jesus, and the Lord as if they were all separate individuals, but according to the Bible, God and the Lord refer to the same entity, and Jesus is the Lord. When we pray, we should do so in Jesus' name as He is the mediator between God and man.
Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. John 14:6 WEB
Be it known unto you all, and to all the people of Israel, that in the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, even in him doth this man stand here before you whole. This is the stone which was set at nothing of you the builders, which was made the head of the corner. There is none other name under heaven, that is given among men, though we must be saved. Acts 4:10-12 WEB
Let us pray for your dad:
Heavenly Father, we come before you in the name of Jesus Christ, lifting up the dad of the one who submitted this request. Lord, you know his suffering and pain. You know the concerns of his child, and You care for them both. We pray for Your healing touch upon his body. Specifically, that You will heal his headaches, seizures, and all other afflictions. Lord, you are Jehovah Rapha, the Lord Who Heals. Please give his family, especially his child, the gifts of faith and peace in this situation.
And the apostles said unto the Lord, Increase our faith. Luke 17:5 WEB
Be anxious for nothing, but in everything by prayer and supplication with thanksgiving let your requests be made known unto God. And the peace of God, which passeth all understanding, shall guard your hearts and your thoughts in Christ Jesus. Philippians 4:6-7
If it is Your will, Lord, we ask for complete physical healing. We also pray for the spiritual healing and well-being of both father and child. Draw them closer to You and to each other during this time. Give them the strength and endurance to face each day with courage and hope as they wait on You. We pray for the day when they can testify of Your goodness and healing power. We ask this all in the mighty name of Jesus Christ, our Lord and Savior. Amen.
Is any among you suffering? Let him pray. Is any cheerful? Let him sing praises. Is any among you sick? Let him call for the elders of the assembly, and let them pray over him, anointing him with oil in the name of the Lord, and the prayer of faith shall save him that is sick, and the Lord shall raise him up; and if he have committed sins, it shall be forgiven him. Confess therefore your sins one to another, and pray one for another, that ye may be healed. The supplication of a righteous man availeth much in its working.
Beloved, I pray that in all things thou mayest prosper and be in health, even as thy soul prospereth.
3 John 1:2 WEB