Can son create new HUF after death of father ?

Scenario: 1. Father passed out intestate leaving behind mother (wife of father) and only son. 2. Father did not created HUF in his name when he was alive. 3. Neither father(deceased) nor mother(alive) was/is karta of any of ancestor's HUF (Probably no ancestor's HUF exist in paper). 4. Father(Deceased) was heir of grand father's immovable property (house and land) and these properties are still in grandfather's name and their are other heirs of grandfather also like uncles and aunts. 5. Son is married and has wife and kids. 6. Son had previously created HUF in his name when father was alive. Son's HUF already has PAN allotted. 7. Son's HUF has son's wife and son's kids (minors) as members or coparcenors. Query : 1. Can this son create new Hindu Undivided Family (HUF) with no change to his own HUF ? Is that legal ? 2. If yes, in whose name it should be created (in name of Late father ? Mother ? Son? ) as son has already HUF in his name ?