Need to about my Share in the House Property & Money in Bank & Post Office Accounts

My father passed away on dated 20/01/2024 & he did two marriages in his life. I am the only son (Age = 66) from his first wife (who passed away in my childhood). I have two children, one is son (married) & another is daughter (married). After passing away first wife, my father married to my step mother (Age - 74). My step mother has only daughter (Age - 49) who got married in 1995 and she has 1 child (unmarried). *My 1st question is please guide me about my house property share as per my family tree given above. *My 2nd question is about how much claim can i mention in succession certificate into my father's bank accounts & post office amounts. But there is some key points in financial activities, please go throgh them as mentioned below... In SBI bank, my father has solo saving account without any nominee, so please guide me how many legel heir and what are their share percentage to claim those amounts. In BOB bank, my father and my step mother has joint account, and my father did FDs also and all are metured but without mentioned FD nominee and without mentioned FD either or survivor, so please guide me how many legel heir and what are their share percentage to claim those amounts. Apart from this my step mother closed few FDs & recieves money from them without notified me. In Post Office, my father made 4 NSCs and all are having nominee mentioned either name of my step sister & son of my step sister, so please guide me how many legel heir and what are their share percentage to claim those amounts. And my 3rd question is how can i apply succession certificate for bank & post office amount claim ? Please guide me as per above mentioned points.