Partition of huf

There is a father's HUF which has to be partitioned. Father had three children's. Father had expired long back and his only son was the karta of HUF. In the book of accounts as on 31.03.2018, HUF has given loans to members. HUF also has few investments, bank balance and some cash in hand. My queries are as follows: 1) Whether the HUF consists of only father's three children or their lineal descendants also. If yes, then till what level the descendants have to be taken. 2) Whether deed of partition has to be prepared, and if yes, whether the same has to be registered at court. 3) Whether the loan given to members has to be taken back before partition of HUF and the final corpus has to be distributed between members. 4) Whether the amount standing on the date of partition has to be equally distributed to each member or there can be unequal partition also. 5) Whether we have to inform Income Tax Officer (ITO) for partition that is to take place. 6) Whether any other things have to be taken care before or after the actual partition of HUF.