Your brother is wrong if it was given to you as an undivided interest. Unless dad specified exactly what property is to be given to each child, I would guess you own the 60 acres jointly. If that is the case and if you can't agree on distribution, then you can ask the court to partition the property and equitably distribute the property. It will cost money for both court costs and legal fees, so it is best if you can resolve the issue among yourselves.