We understand that you're facing a challenging situation at home, ###, and we're here to pray and provide counsel based on biblical principles.
Firstly, it's important to remember that God's design for marriage is a lifelong commitment between a man and a woman, and He wants us to have peaceful and joyful homes. As it is written in Mark 10:9, "What therefore God has joined together, let not man put asunder."
In this situation, it's crucial to address the issue with your husband's brother in a biblical manner. First, try to talk to him peacefully about the concerns you have Ephesians 4:29, "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." If he doesn't listen, then you and your husband should address this together, following the principles outlined in Matthew 18:15-17.
It's also vital to pray for your husband's brother. Remember, "But I tell you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who mistreat you and persecute you," Matthew 5:44.
Regarding the issue of tongue-speaking negative things, we should remember that the power of the tongue is discussed in James 3:5-6, "Even so the tongue is a little member, and boasts great things. See how great a forest a little fire kindles! And the tongue is a fire, a world of iniquity. The tongue is so set among our members that it defiles the whole body, and sets on fire the course of nature; and it is set on fire by hell." Therefore, pray that God will silence any negative talk and fill your home with blessings instead.
Now, let's pray together:
Dear Heavenly Father,
We come before You in the name of Jesus Christ, lifting up ###, her husband, and their marriage. Lord, You know the struggles they're facing, and we ask for Your divine intervention. We pray that You will soften the heart of her husband's brother, and that he will willingly move out and find his own place. We rebuke any evil spirits that may be causing division and strife in their home, and we command them to flee in Jesus' name.
Lord, we also pray that You will silence any tongue speaking negative things about ###. May Your words be the only words spoken over her life. We ask for your protection over ### and her husband's unity, and that their love for each other will grow stronger and more joyful each day.
We believe and trust that in the name of Jesus, Your will be done in their lives. ###, remember that there is no other name under heaven by which we can be saved: "in none other is there salvation, for neither is there any other name under heaven, that is given among men, wherein we must be saved." Acts 4:12, but in the name of Jesus. Always pray in His name. Jesus said, "If you will ask anything in my name, I will do it." John 14:14
By praying in Jesus' name, you are assured that God hears your prayer and will answer according to His will.
In Jesus' name, we pray. Amen.
Lastly, ###, continually strive to make your home a place of peace and love. Keep praying together with your husband, and always remember that God is with you. "And we know that all things work together for good to them that love God, to them who are the called according to his purpose." Romans 8:28.
Articles:
Amen, Joseph! Trust God's promises, "No temptation has overtaken you except what is common to mankind. And God is faithful; he will not let you be tempted beyond what you can bear" (1 Cor 10:13). Lifting up @Whiulpersin for freedom and @Feiran for financial relief. Together, "Carry each other’s burdens, and in this way you will fulfill the law of Christ" (Gal 6:2). In Jesus' name! 
Joseph Gelli:
be-an-encourager.blogspot.com
