We are truly sorry to hear about the struggles you and your family are facing with your brother. It's important to remember that God cares deeply for each one of us, including your brother, and that He is able to bring peace and comfort to our most difficult situations.
Firstly, we want to address the behavior of your brother. It is not acceptable for him to be rude, unpleasant, or screaming at you or your mother. It is a sin to behave this way. Even though it may be more difficult for him due to his autism, it is still a sin. Ephesians 4:31-32 WEB states Let all bitterness, wrath, anger, outcry, and slander, be put away from you, with all malice. And be kind to one another, tenderhearted, forgiving each other, just as God also in Christ forgave you.
We are concerned about your brother's behavior and pray that he will be convicted of this sin and turn to Christ for forgiveness and change from this behavior.
We also want to address the fact that your brother is not allowing your mom to talk on the phone with her friends. This is not healthy behavior for him or your mother. He needs to understand that it is not godly or healthy to be controlling, isolating, and manipulating her. Philippians 2:3-4 WEB states Do nothing from selfishness or empty conceit, but in humility consider others better than yourselves. Each of you should look not only to your own interests but also to the interests of others. We pray that he will turn from this sin and allow your mother to have friends and time away from him.
It's encouraging to see that you and your family are trusting in the name of Jesus Christ for healing. We must remember that healing can come in many forms, and God's will is always perfect. We pray that your brother will be healed physically, mentally, and spiritually.
Let's pray together:
Dear Heavenly Father,
We come before You today, lifting up our beloved brother and family to You. We know that You see their struggle, You know the difficulties they are facing and the pain they are experiencing. We ask You Lord Jesus Christ, by Your name, to heal our brother. Give him the peace, healing, growth, and change that only You can give.
We ask for Your will to be done in his life and in the life of our family. We trust in You, Lord, and we know that You are able to do far more abundantly than all that we ask or think, according to the power that works in us. (Ephesians 3:20 WEB)
Lord Jesus Christ, we also pray for our brother's behavior. We ask that You convict him of his sins and lead him to repentance. We pray that he will be respectful, kind and loving to others. We pray that he will turn to You for forgiveness and change from these behaviors.
We also pray for our mother. We ask that You give her strength, patience, and wisdom as she deals with our brother. We pray that You will provide her with the support and love she needs from her friends and family to cope with this difficult situation.
Father, we also pray for our family. We ask that You give us the strength, wisdom, and love to support her and our brother during this difficult time. We pray that You will help us to be a family that is loving, supportive, and understanding.
We ask all of these things in the powerful and precious name of our Lord and Savior, Jesus Christ. Amen.
May God's peace, love, and comfort be with you and your family during this time. Remember to cast all your anxieties on him, because he cares for you. (1 Peter 5:7 WEB)
Of course, it is also important to seek medical and professional help for your brother's condition, as God often uses doctors and professionals as a means to bring healing and help to us. Also, consider counseling for your mother and family to help cope with this situation.
Lastly, remember to be patient and kind with your brother. Love him as Jesus loves him. Be a support and strength to him and your family as you heal from the passing of your father.
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. 
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