I am familiar with your situation. Be the instrument of change in your family. Apologize for any part that you were a part of. Talk to the minister or priest about bringing up that your mother would want a family reconciliation. Have fait in God. Invite Him into your lives. Sometimes we need to take things slow with siblings and others. Give them each a call in a couple of weeks to ask how they are doing. Small steps can make for big changes. My prayers are with you to be strong. I am so sorry for your loss of your mom.
I am so sorry for the difficult trials you are going through. During these times it is important to strengthen your relationship with Christ. Surrender your burdens to God. Have faith and trust in Him. Always conduct yourselves as Christians. I will pray for you that God's Will be done.
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You should seek legal aide to get possession of your land. I am assuming that the deal you made with the two men was with the advise of an attorney. Your state Medicaid should give you medical insurance and food stamps.