Theresa Sokaitis, 84, of Middletown said she and her sister, Rose Bakaysa, 87, were longtime gambling partners and drew up a contract outlining their plans to share in any winnings, the Hartford (Conn.) Courant reported Tuesday.
However, Sokaitis said she never saw any cash from Bakaysa's $500,000 Powerball jackpot in 2005.
"I'm just going after my own money. Do I feel I deserve it? Not for me, but my children deserve it," Sokaitis said.
However, lawyers for her sister said the siblings had a falling out more than a year before the jackpot, making the agreement void.
"The contract was rescinded," attorney William Sweeney said. "Evidence will show that an argument they had in 2004 broke up their partnership. That will be a factual question for the court to decide."
Sweeney said the Powerball ticket was purchased by his client's brother, Joseph Troy Sr., and they held the ticket jointly as partners.
The Superior Court trial was scheduled to begin Tuesday in New Britain.