Two sisters draw up a contract to split all gambling winnings. Then they stop talking. One wins a $500,000 jackpot and now the other one wants her half. Should she have to split it with her sister?

Name: Public opinion poll: Two sisters draw up a contract to split all gambling winnings. Then they stop talking. One wins a $500,000 jackpot and now the other one wants her half. Should she have to split it with her sister?
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