Context
Amarnath (Hindu) owned residential flat in Thane city, Maharashtra. He died intestate in 2010. He was survived by his wife, married (eldest) son, widowed daughter (has a son and stays in Amarnath's flat) and married daughter (youngest, stays in Mumbai). After Amarnath's death in 2010, building society transferred the flat in the sole name of Amarnath's wife (share certificate bears her name, property tax bill, electricity bill bears her name)
Amarnath's son died in 2013. He's survived by his wife, doesn't have children.
Amarnath's son and daughter-in-law separated from Amarnath and his wife about 18 years ago, they stayed in a rented flat in Mumbai.
Amarnath's wife died intestate in 2018.
Question(s)
Being the only surviving legal heirs of Amarnath, does the two daughters have equal share in the flat?
Can the deceased son's wife claim a share in the flat? does she have a legal share in the flat by virtue of succession?
Widow daughter and her son are currently staying in the flat. How would younger daughter get her share?
Can housing society transfer the flat in joint names of Amarnath's daughters and issue share certificates bearing both their names?
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Thanks in anticipation for response.