Death of proprietor

Prashant (PROPRIETOR) (38 Points)

21 May 2019  
In my case proprietor is passed away. He has three daughters, one daughter wants to continue this business. Stock in hand, but no itc in electronic credit ledger.
My question is how to full fill all legal actions in GST.
1. no itc in electronic credit ledger then how to itc reverse.
2. After death of proprietor of we can't issue sale bill then how to sale material which is in stock
3. If material sold to new proprietory firm today - is this a legal move.