My question involves personal finance in the State of: Ohio

A family member asked me for a very large chunk of money. I don't want to be too descriptive but the money was supposed to be payed back in 4 months. They are unable to take a loan out on the house, or so they say, and they have yet to give me my money.

Recently while asking me for more money, to sum it up they told me to screw off.

Is there a legal route I can go to get this money back? If so, would a lawyer be willing to get paid from the winnings of the case? How do I go about doing this.