Assuming at the time of sale of land, it is owned by the individuals as mentioned in the question. You can avail the benefit u/s 54EC or 54F.
u/s 54EC you can invest in the notified bonds within 6 months from the date of sale of the asset. maximum exemption available is Rs. 50 lacs
u/s 54F you have to invest in a residential house property subject to stipulations
For detailed discussion you may opt for phone consultation