How do we get 1.84 acres of land into my mom's name that my dad left to her in his will?

Probating a will after 4 years is only okay if you are not "in default" for failing to probate it. Since you knew about it, that may be a high...

I agree with the above answers. "A contract trumps a will." This is obviously an over-simplification, but it seems to put it in non-lawyer terms...