The estate of the deceased still retains legal title to the lands, and still has equity in the lands until the land contracts are paid off. That is real property. The income on the contract is personal property, but it might have some kind of peculiar standing since what it really represents is liquidation of the equity in the property.
Sounds to me like you might have a problem where the real property belongs to someone, and it is being converted into personal property that belongs to someone else?