Reestablishing Twitter Account

Hi from Our organizations twitter account we set up years ago from the son of our Chairman. However, it's been years since the account has been used and I am now the chair over communications. Our twitter account is on all our documents so we can't change it. We're trying to find a way to regain access to our account and start using it again. The original person that set it up was Nathan Trueblood or Bruce Trueblood but neither are able to remember the original information to gain access. They also are no longer in our organization because of things just like this where they changed information on us and refuse to give it back to us. Is there anyway we can get access to our account again or is it impossible? Kim Bray Vice Chair Republican Party of Marathon County. Thank you.