What is the ruling on dividing a small plot of land among a large number of heirs, given that some of them passed away before receiving their share, and what is the ruling on one of the heirs benefiting from this land without objection from the others?

If the land is indivisible, it should be appraised and then sold, and the price distributed among the heirs of the deceased. If any of the heirs dies after becoming entitled to the inheritance, their own heir takes their place. As for one of the heirs opening a shop for their own benefit, there is no harm in it if it is with the consent of all adult and sane heirs. Otherwise, it is an encroachment upon the rights of others, and its existence does not affect the collective ownership of the land.