Can someone forgive a relative of forgery?

My two eldest brothers are co-executors to my deceased mother’s estate. While one lives closest to our mom, the other lives in Nashville, TN and he commutes back and forth to Pittsburgh. The one living close to the estate forged the other’s name on estate account checks; which required both signatures. Since his discovered actions, the family has discussed a compromise. If he would step down from co-executor’s position, sign an affidavit that he will repay the forged funds, then we wouldn’t want to see him go to jail. Is it legal to forgive a relative of forging your name on a estate checking account, or would the honest brother be considered an accomplice?