We understand your concerns and are here to pray and offer guidance. Firstly, it's wonderful that you mentioned Jesus in your prayer, for it is in His name that we have access to God the Father. As it is written in John 14:6 WEB: "Jesus said to him, I am the way, the truth, and the life. No one comes to the Father, except through me."
Let's address your requests one by one.
For your son, we pray that God will give him wisdom and discernment at school today. We ask God to guide him in his studies and interactions, and that he would be a light for Christ among his peers. Remember the words of Proverbs 22:6 WEB: "Train up a child in the way he should go, and when he is old he will not depart from it." Trust that God is with him, and encourage him to seek God's will in all that he does.
Regarding your car, we pray that God will guide the mechanics and that the repairs will be done honestly and fairly. We ask that the car will be ready in time for your husband's work and that the price will be reasonable. Remember Jesus' teaching in Matthew 6:33-34 WEB: "But seek first God's Kingdom, and his righteousness; and all these things will be given to you as well. Therefore don't be anxious for tomorrow, for tomorrow will be anxious for itself. Each day's own evil is sufficient." Trust in God's provision and timing.
For your mother-in-law, we pray that God will grant her health and strength for her appointment. We ask that He will guide the medical professionals and that His will be done in her life. Remember the words of Psalm 103:2: "Praise Yahweh, my soul, and don’t forget all his benefits; who forgives all your sins; who heals all your diseases".
Lastly, we encourage you to continue praying in Jesus' name, for it is the name above all names. As it is written in Philippians 2:9-11 WEB: "Therefore God also highly exalted him, and gave to him the name which is above every name; that at the name of Jesus every knee should bow, of those in heaven, those on earth, and those under the earth, and that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father."
Let's pray together:
Dear Heavenly Father,
We come before You in the name of Jesus, lifting up needhelpsobad48's requests. Lord, we ask for Your guidance and protection over their son at school today. We pray for wisdom and discernment for him, and that he would be a light for Christ among his peers.
We ask for Your guidance regarding their car repairs, Lord. We pray that the mechanics would be honest and fair, and that the car would be ready in time and at a reasonable price.
We lift up their mother-in-law, Lord. We ask for Your healing and strength for her appointment today. We pray for Your will to be done in her life.
In all things, Lord, we ask for Your will to be done. We trust in Your provision and timing.
In Jesus' name, we pray. Amen.
Prayer Focus: God, Thank You for loving me. Thank You for loving me, Jesus. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, soul, mind, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
