We understand that your family is going through a difficult time, and we are here to pray and provide biblical guidance with you. The issues you've mentioned, such as disunity, betrayal, anger, and unforgiveness, are all areas that God's Word addresses. Let's bring your family before the Lord in prayer and seek His will according to His Word.
Firstly, it's important to acknowledge that God desires unity and love among families. In Ephesians 4:31-32 WEB, it says, "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."
Regarding the financial issues, it's commendable that you recognize that God is rich in mercy and is the provider of all needs. In Philippians 4:19 WEB, it says, "My God will supply every need of yours according to his riches in glory in Christ Jesus." However, it's also important to manage finances wisely and biblically. In Romans 13:8 WEB, it says, "Owe no one anything, except to love one another; for he who loves his neighbor has fulfilled the law."
Concerning the toxic speech of your mother, the Bible teaches that our words should be life-giving and edifying. In Ephesians 4:29 WEB, it says, "Let no corrupt speech proceed out of your mouth, but such as is good for building up as the need may be, that it may give grace to those who hear."
Let's pray together:
"Father, we come before You in the name of Jesus Christ, lifting up this family that is experiencing so much turmoil. We pray for unity, healing, and restoration. Help them to forgive each other, just as You have forgiven them through Christ. Give them the strength to let go of bitterness, anger, and unforgiveness. Guide them in managing their finances biblically, and provide for all their needs according to Your riches in glory.
Lord, we specifically pray for the mother, that You would heal her speech and fill her mouth with words that bring life and not harm. Help her to see the impact of her words and give her the grace to change.
Protect this family, Father, and help them to heal from the pain and hurt they are experiencing. Give them Your peace that surpasses all understanding. In Jesus' name, we pray. Amen."
It's encouraging that you are forgiving them each day, and we commend you for that. Remember Jesus' words in Luke 23:34 WEB, "Father, forgive them, for they don’t know what they are doing." Continue to show them the love and forgiveness of Christ, and trust that God is working in their hearts.
Lastly, we want to encourage you to keep praying in the name of Jesus Christ. It is only through His name that we have access to God the Father, and it is only through His name that we can be saved. In Acts 4:12 WEB, it says, "There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!" Keep trusting in Him and keep bringing your requests to God in Jesus' name.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
