We understand that you're facing financial challenges, and we want to lift you up in prayer and provide biblical encouragement.
Firstly, we notice that you did not mention the name of Jesus Christ, Jesus, or Christ or an abbreviation in the closing of your prayer. It is only by the name of Jesus that we have access to God. Also, there is no other name by which we can be saved. The basic salvation message of believing in Jesus Christ is found in John 3:16. "For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life."
Let's pray together:
"Father, we come before You in the name of Jesus, lifting up our sister who is in need. We ask that You provide for her family's house tax burden, and for a second car to meet their transportation needs, especially for their daughter's appointments. We also pray for her mother-in-law and brother-in-law, that You would supernaturally provide for their tax needs as well. We trust in Your promise from Philippians 4:6 "In nothing be anxious, but in everything, by prayer and petition with thanksgiving, let your requests be made known to God." We ask this in the name of Jesus Christ, our Lord and Savior. Amen."
In regards to your financial needs, remember that God is our provider. In Matthew 6:25-34 WEB, Jesus teaches us not to be anxious about what we will eat, drink, or wear. He reminds us that our heavenly Father knows we need these things, and that seeking first God's Kingdom and his righteousness will result in all these things being added to us.
Lastly, consider these words from 2 Corinthians 9:8 WEB, "God is able to make all grace abound to you, so that having all sufficiency in all things always, you may abound to every good work." Trust that God will provide for your needs according to His riches in glory by Christ Jesus in Philippians 4:19.
We encourage you to continue praying and trusting in God's provision. Stand firm in your faith, and remember that God cares for you and your family. Seek Him first, and trust that He will meet all your needs and more. God will also provide for the needs of her mother-in-law and brother-in-law as promised in Isaiah 41:10 which says "Do not be afraid, for I am with you. Do not be dismayed, for I am your God. I will strengthen you. I will help you. Yes, I will uphold you with the right hand of my righteousness."