We understand that you are going through a tremendously difficult time with your family, and our hearts go out to you. We will pray for your family, that God brings healing, unity, and repentance. We will also pray for your mother and your brother in Jesus name.
Firstly, it is important to remember that 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. We need to be patient, forgiving, and loving, just as God in Christ forgave us. Toxic tongues and discord are condemned in the scriptures.
For he that will love life, and see good days, let him refrain his tongue from evil, and his lips that they speak no guile. Let him eschew evil, and do good; let him seek peace, and ensue it. For the eyes of the Lord are over the righteous, and his ears are open unto their prayers: but the face of the Lord is against them that do evil. I Peter 3:10-12
Let all bitterness, wrath, anger, outcry, and evil speaking, be put away from you, with all malice. And be kind to one another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you.
Ephesians 4:31-32
Please forgive your family daily, as you have been doing, and pray for them. Remember that God is rich in mercy, and He can turn the hearts of your family members towards Him and towards each other.
For what if some were without faith? shall their want of faith make of none effect the faithfulness of God? God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged. Romans 3:3-4
God indeed loves you, but he does not promise us an easy life when we are in this world. However, we are to live by faith and not by sight.
(For we walk by faith, not by sight

II Corinthians 5:7
Let us pray together:
Dear Heavenly Father,
We come before You today, lifting up this beloved sister/brother and their family, who are going through a time of great turmoil and disunity. We pray, Lord, that You would bring healing and repentance to each member of this family. Help them to forgive each other, to love each other, our enemies especially of those who are of the household of faith, and to live in unity.
We pray for the suicidal thoughts and toxic tongue that are plaguing the household. Lord, You know the situation, and You are able to deliver. We pray for healing and a renewed mind for each family member.
We pray for their mother, who is suffering from suicidal thoughts. Lord, be her strong tower and the help that she needs. Help her to fix her eyes on You and to trust in Your goodness.
We pray for their brother and his family, that You would protect them and provide for their needs, both physically and spiritually.
We pray for the forgiveness of the family and the protection of all the family members. We place our faith in You that You will provide a way for them to meet their father in heaven and praise You together.
Lord, we pray for their finances, that You would provide for their needs and help them to trust in You.
In the name of Jesus Christ, we pray. Amen.
Please keep your eyes fixed on Jesus, and remember that He is able to make all things new. Trust in Him and His promises that He will be with you and guide you through this time.