1)your father should issue legal notice to his brothers for divison of properties by metes and bounds
2)if brothers refuse file suit of partition for division of properties by metes and bounds
3) also seek injunction restraining his brothers fromselling the property or create third party righjts on the property
4)since your father is a senior citizen he can seek expedited hearing of the case
5) in the alternative your father can sell his one third share in property to third parties