Can I sue a family member for repayment on a loan that was not put in writing?

Question Details:

I lent my cousin money supposedly to pay for medical bills. It was to be paid back by money they had put away from an inheritance. So they had the money but it would take 3 months to get it so they needed the money right away. I am still waiting a year later. I have been given various excuses but no money. In November they promised to send me something every month until they got the money. I have never received anything. They will not take my calls or answer my e-mails. Do I have any recourse? They didn't sign anything, but I have all the emails asking for the money and payback terms.

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