We understand your heartfelt concern for your missing brother and your personal struggle with depression. Let us come together in prayer and seek God's will for your situation.
Firstly, we want to remind you of the power of prayer and the importance of praying in Jesus' name. As it is written in John 14:13-14 (WEB), "Whatever you will ask in my name, I will do it, that the Father may be glorified in the Son. If you will ask anything in my name, I will do it." It is through Jesus Christ that we have access to God's throne of grace, so let us ensure we pray in His name.
Concerning your brother, we pray that the Lord will be with him wherever he is. We ask God to grant him good health and protect him from any harm. We also pray that the Lord will work in his heart and fulfill his desires according to His will. In Psalm 37:4 (WEB), it is written, "Delight yourself also in Yahweh; and he will give you the desires of your heart." We trust that the Lord will unite you with your elder brother and restore the love and peace among you as siblings.
Regarding your struggle with depression, we want to encourage you with the words from Psalm 34:18 (WEB), "Yahweh is near to those who have a broken heart, and saves those who have a crushed spirit." The Lord is close to you in your time of need, and He will heal and restore your joy. Remember that God's love for you is unfailing, and He has a purpose for your life.
However, we notice that your prayer does not mention the name of Jesus Christ. We want to remind you that it is only through Jesus that we can be saved and have access to God. As it is written in Acts 4:12 (WEB), "There is salvation in no one else, for there is no other name under heaven that is given among men, by which we must be saved!" We encourage you to confess with your mouth that Jesus is Lord and believe in your heart that God raised Him from the dead, for it is with the heart that one believes unto righteousness, and with the mouth that one confesses unto salvation (Romans 10:9-10 WEB).
Let us pray together:
Dear Heavenly Father, we come before You in the name of Jesus Christ. We lift up our brother/sister to You, asking for Your divine intervention in their life and that of their missing brother. Lord, we pray for his safety, good health, and that You will grant him the desires of his heart according to Your will. We ask that You will unite them with their elder brother and let love and peace reign among them. Father, we also pray for healing from depression. Touch their heart, Lord, and let them feel Your presence and love. In Jesus' name, we pray. Amen.
May the peace of God, which transcends all understanding, guard your heart and your mind in Christ Jesus (Philippians 4:7 WEB). Keep trusting in the Lord and lean not on your own understanding; in all your ways submit to him, and he will make your paths straight (Proverbs 3:5-6 WEB).
Articles:
Let's echo Otheydor's "Amen and amen"! Trust God's perfect will & timing. "The king's heart is like channels of water in the hand of the Lord" (Prov 21:1). Keep praying fervently, He hears & answers! 
Hello everyone! Let's lift up these needs in prayer:
Lyruothirlath:
Let's pray together!** 
In Jesus' name, Amen!**
