Terminating Alimony by Agreement

[novice22]

What is the name of your state? Minnesota
My father-in-law and mother-in-law are divorced (for the last 12 years), and he had been ordered to pay $2000 a month in alimony for life. He has recently retired and would likely be able to get a modification or cessation of these payments due to changed circumstances. They have spoken and agreed to a final lump sum payment of $30,000 to settle the alimony issue forever. My question is, how do they do this with the court to ensure that the settlement is accepted and binding? I don't have any reason to think that my mother-in-law wouldn't honor the settlement and would try to enforce the original order, but obviously we'd all as a family rather avoid any unpleasantness in the future and I know my father-in-law is hesitant to make the payment until he knows it really will be final.

[000]

They need to hire a family law attorney to draw up the stipulated papers and try to get the judge to sign the order.