Deed Lines being moved based on agreement

[Neddrick G.]

Hello. This is an email I received from my local attorney who has done numerous closings for me on real estate transactions. I'm wanting to get an unbiased answer so I havent posed this question to him. Heres the email, I've changed the names:

"John and Mary, and their daughter Katy are in the process of purchasing the house of Michael. I am enclosing a copy of the plat which sets out the property being located at the southeast corner of Richter and Jones Street.

When Jimmy and Suzanne purchased the house several years ago that you now own on Avenue, an updated plat was done by Larry G. dated 12/19/2000. I am enclosing a copy for your information. Michael agreed to a new property line which was much less than the deed of the property that was originally deeded into him. You can see the deed line shown to the south and to the east of his property.

John has requested that I contact you and ask if you would be willing to go back to the original deed lines, or modify the current deed lines in order that there would be enough room for a driveway to be added and a larger back yard. The current "agreed to" boundary lines leave very little room.

I am not representing John in this matter, but told them I would forward this information to you for your review."

My question is, do I have to comply to this request? I do not want to give up any piece of my property so I'm wanting to know if this has to go thru the courts would I be victorious. Have any of you had this happen before?