Is it obligatory to distribute the proceeds from the land among the sons and daughters, considering that the land was owned by the deceased father, or should the money be given only to the mother because she re-rented the land after it was confiscated?

The rental contract is not terminated by the death of the tenant; rather, it transfers to their heirs. Purchasing the land makes it your property, and the confiscation decision does not affect it because it is an usurpation. You are permitted to sell the land and distribute the money among all heirs according to each one's share of inheritance.