how can I make money on this deal?

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my Grandma has very old house that is on a valuable peice of wisconsin land, it is in Green Lake, becoming the next Lake Geneva, my parents have a contract with a brokerage firm that says they get 5%. I want to help sell the property and make a commission. How can I get an agreement with the local broker that says if I find the buyer, I get 2.5%

Also, I think with my sales skills, I can sell it for more than they have it listed for on the MLS.

I am confident I can find a buyer, we need to sell the house quick and I don't want my Grandma's financial state to be in control of a non-motivated brokerage. I want to help, but also make a nice chunk of change off the deal. Anyone want to help me or lead me in the right direction?

thank you

:mrgreen: