Question

What concession did Grant make to Lee in his terms of surrender?

Answer 1

I had to answer the same question and this is what i put
 Grant offered the same terms he had before: 

In accordance with the substance of my letter to you of the 8th inst., I propose to receive the surrender of the Army of N. Va. on the following terms, to wit: Rolls of all the officers and men to be made in duplicate. One copy to be given to an officer designated by me, the other to be retained by such officer or officers as you may designate. The officers to give their individual paroles not to take up arms against the Government of the United States until properly exchanged, and each company or regimental commander sign a like parole for the men of their commands. The arms, artillery and public property to be parked and stacked, and turned over to the officer appointed by me to receive them. This will not embrace the side-arms of the officers, nor their private horses or baggage. This done, each officer and man will be allowed to return to their homes, not to be disturbed by United States authority so long as they observe their paroles and the laws in force where they may reside 
The terms were as generous as Lee could hope for; his men would not be imprisoned or prosecuted for treason. In addition to his terms, Grant also allowed the defeated men to take home their horses and mules to carry out the spring planting and provided Lee with a supply of food rations for his starving army.