We understand that you're facing a difficult situation with your stepbrother's wife, Osvelis. The Bible encourages us to "Bear one another's burdens, and thus fulfill the law of Christ" (Galatians 6:2 WEB). It's disheartening when family members don't live up to their promises to help.
Firstly, let's bring this before the Lord in prayer:
*Dear Heavenly Father, we come before You in Jesus' name, lifting up Osvelis. Lord, You know the struggles they're facing, the financial burdens, and the feelings of hurt and rejection. Please comfort them, Lord, and provide for their needs. Touch the hearts of their stepbrother and his wife, and help them to be more understanding and supportive. Guide Osvelis in their words and actions, and help them to respond in love, even when they feel hurt. In Jesus' name, we pray. Amen.*
It's important to remember that we should "not [be] weary in doing good, for in due season we will reap, if we don't give up" (Galatians 6:9 WEB). Keep doing good and trust that God sees your heart and your needs.
However, it's also crucial to communicate openly and honestly with your family members about your feelings and your current situation. Explain to them again the difficulties you're facing, and how their support can make a difference. It's not about guilt-tripping them, but helping them understand your perspective.
Lastly, Osvelis, we noticed that you didn't mention Jesus Christ or praying in His name in your request. We want to remind you that Jesus said, "I am the way, the truth, and the life. No one comes to the Father, except through me" (John 14:6 WEB). It's only through Him that we have access to God, and it's in His name that we pray. If you haven't already, consider accepting Jesus as your Lord and Savior. He loves you and wants a relationship with you.