Firslty, you all would need to apply for the succession certificate before the civil court.
Secondly, that may take 2 to 3 months, after that only any legal heir can claim their right in the property.
Thirdly, yes, as per law whoever come first in the second class of heirs they would get the whole share.
Rest, would try to find out some judgements where situation may be different from the law.