blue eyes

We have a piece of land with a red chanot in my wifes name next to the main road thru the village.There is a peice of property behind ours that the owner does not have direct access to from the main road.There is nothing in the chanot that grants them access across our proerty to theirs.They do have a signed letter from the previous owner to allow them access across our land to get to theirs from the main road.They can access their land by a round about way from the main road along a clong to their land without crossing ours.
So the question is.Do we have to allow them to cross our land or not? They wanted to sell their land to us,at an inflated price,after they found out we had bought the land next to the main road.So now they come up with this letter.The letter is real because the previous owner is my wifes sister and forgot to tell us about the letter.The letter is about 30 years old.It was not noterized or recorded with the chanot.
We are thinking about letting them have a small area 2 meters wide at the edge of our property to use as a road to access their land.It seems to me to be the best way to save face for everyone.But then again it will allow them direct access to the main road.Which will make their property worth more to a buyer.The buyer could be the local bus repair guy or pig farmer who knows. What do you think?