How to prove

we are fighting out a case(Partition suit) with our uncle in whose name the electric bills are coming.But he has never stayed in our house(though being the joint-owner).from the very beginning we have been paying the electric bills in cash.How can I prove that we have been paying it? Please need help The written statemnt submission will be done tomorrow 8th Jan 2013 Mail me :sam.rudrakshads@gmail.com