Please consider reaching out to others whom you trust; your father, or anyone whom you look upto perhaps? If you still don't find any support, please contact the child helpline 1098.
Please remeber that regardless of what anyone may say, the abuse is real for you and it is not your fault, in any way. Continue to seek support on this matter.
Go and complaint to the other members of your family. This is a crime and you shouldn't allow him regardless of him being your relative.