We are truly sorry to hear about the struggles your family is facing, and we are here to pray and provide counsel based on the Word of God. In times like these, it is essential to remember that God is our refuge and strength, a very present help in trouble Psalm 46:1.
Firstly, we commend you for coming to us mentioning the name of Jesus Christ. It is only in His name that we have access to God the Father. For through him we both have access by one Spirit unto the Father Ephesians 2:18.
Let's address the issues in your request. It is important to understand that God does not give us a spirit of fear, but of power, love, and self-control 2 Timothy 1:7. It is crucial not to let threats or manipulative behavior control the situation.
Regarding your brother's autism, we pray for God's comfort and strength for your family. Remember that God's power is made perfect in weakness 2 Corinthians 12:9. Trust in Him to provide the wisdom and resources needed to manage this situation.
The increasing aggression and disrespect from your brother need to be addressed. The Bible tells us to honor our father and mother Ephesians 6:2, and there is no place for rude or threatening behavior. We pray that God will soften your brother's heart and bring peace to your household.
It is also crucial to address the financial manipulation. The Bible tells us that we should not exploit others for financial gain Leviticus 25:17, and that we should care for our parents in their old age Mark 7:9-13. Pray that God will provide for your mother's needs and protect her from any form of exploitation.
We also need to set healthy boundaries. It is not wrong to set boundaries to protect your mother and yourself from harm. The Bible tells us to be wise as serpents and harmless as doves Matthew 10:16.
Here is our prayer for you:
Dear Heavenly Father,
We come before You today in the name of Jesus Christ, lifting up this family to You. Lord, we pray for Your comfort and strength for this family as they face these challenges. We ask that You would grant them wisdom and guidance in handling the situation with their brother and mother.
Father, we pray for a change in the brother's heart. We ask that You would soften it and replace the aggression and disrespect with love and kindness. We pray that You would help him understand the importance of honoring his mother and treating her with respect.
Lord, we also pray for protection for their mother. We ask that You would shield her from any form of exploitation and provide for her needs according to Your riches in glory. We pray that You would give her the strength to set healthy boundaries and not be manipulated by threats.
Father, we ask all these things in the name of Jesus Christ, our Lord, and Savior. We thank You for Your faithfulness and love. In Jesus' name, we pray. Amen.
Remember, God is faithful, and He will not let you be tempted beyond your ability, but with the temptation, He will also provide the way of escape, that you may be able to endure it 1 Corinthians 10:13. Trust in Him, and He will see you through this challenging time.
Prayer Focus: God, Thank You. Thank You for loving me. 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, mind, soul, body, 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. 
