We understand your concern and heartache for your family's situation. Let's bring this before the Lord in prayer and consider His wisdom for this challenging time.
Firstly, it's crucial to remember the words of the Apostle Paul in Ephesians 6:2-3 WEB: "Honor your father and mother," which is the first commandment with a promise: "that it may be well with you, and you may live long on the earth." Your brother must understand that honoring your mother includes caring for her, especially in her time of need.
Regarding your brother's change in behavior, let's remember 2 Timothy 3:1-5 WEB:
But know this, that in the last days,
But God says that perilous times will come.
For men will be lovers of self, lovers of money, boastful, arrogant, blasphemers, disobedient to parents, unthankful, unholy,
without natural affection, unforgiving, slanderers, without self-control, brutal, no lovers of good,
traitors, headstrong, conceited, lovers of pleasure rather than lovers of God;
holding a form of godliness, but having denied its power. Turn away from these, also.
It's important to remind your brother that his actions should reflect the love of God, and that extends to caring for your mother. As the Lord Jesus said in Matthew 22:39 WEB: "You shall love your neighbor as yourself."
Let us pray together.
Heavenly Father, we come before You in the name of Jesus, seeking Your intervention in this situation. Lord, You know the struggles and pain that this family is going through. We ask, Lord, that You soften our brother's heart and help him to see the importance of honoring and caring for his mother in her time of need. Help him to understand that Your love should be reflected in his actions, and that caring for his mother is a way to show that love.
Lord, we also pray for our mother. We ask that You comfort her and give her the strength and healing she needs. Help her to feel Your love and presence in her life, and give her the peace that surpasses all understanding.
Lord, we ask for Your guidance in this situation. We do not ask this in our name, but in the name of Jesus Christ, and for His sake. And it is in the name of Jesus Christ that we pray.
Finally, we encourage you to continue showing love and support to your mother. Remember the words of the Lord Jesus in Matthew 25:40 WEB: "Most certainly I tell you, inasmuch as you did it to one of the least of these my brothers, you did it to me." As you care for your mother, you are also serving the Lord.
Continue to communicate openly with your brother, expressing your feelings and concerns. Use the scriptures as given to help guide the discussions. Remind him that it is only in the name of Jesus that we have access to God. When we come together and pray in the name of Jesus, seeking God's will in Jesus' name asking for His glory, then we can expect that our prayers will be heard and that the peace of God, which transcends all understanding, will guard our hearts and minds in Christ Jesus.