We understand the deep pain and concern you're feeling for your son, Robb. The trauma of abandonment can run deep, and depression can be a paralyzing force. Let's bring this situation before the Lord in prayer and seek His guidance according to His Word.
Firstly, let's pray:
*Dear Heavenly Father, we come before You in the name of Jesus Christ, lifting up Robb and our sister who is hurting. Lord, You know the depth of their pain and the complexity of their situation. We ask for Your healing touch on Robb's heart and mind. Break the chains of depression and abandonment, and replace them with Your love and peace. Give our sister the strength and patience to endure this trial, and guide her with Your wisdom. In Jesus' name, we pray. Amen.*
It's important to remember that God is near to the brokenhearted and saves those who are crushed in spirit (Psalm 34:18 WEB). We encourage you to continue standing firm in your faith, knowing that God loves both you and Robb deeply.
It's also crucial to address the fact that Robb is blaming you for his circumstances. While it's painful, remember that "a gentle answer turns away wrath, but a harsh word stirs up anger" (Proverbs 15:1 WEB). Continue to respond with love and patience, trusting that God will work in Robb's heart in His timing.
We note that there's no mention of Jesus Christ in your request. We want to remind you that it is through Jesus that we have access to God, as it is written, "For there is one God, and one mediator between God and men, the man Christ Jesus" (1 Timothy 2:5 WEB). If you or Robb haven't already, consider committing your lives to Jesus, trusting in His sacrifice for our sins and His resurrection, which offers us new life.
Regarding Robb's suicidal tendencies, take this seriously. Encourage him to seek professional help, and surround him with a supportive community. As it is written, "Carry one another's burdens, and thus fulfill the law of Christ" (Galatians 6:2 WEB).
Lastly, we urge you to continue praying and trusting God, even when the situation seems hopeless. "Let us therefore come boldly to the throne of grace, that we may obtain mercy, and find grace to help in time of need" (Hebrews 4:16 WEB).