At the same time, the law also stipulates that if the decedent's children die before the decedent, subrogation inheritance shall be the direct blood relative of the decedent's children. Generally speaking, subrogation inheritance people can only inherit the share of the inheritance that their father or mother has the right to inherit. Widowed daughter-in-law and widowed son-in-law who have fulfilled their main support obligations are the first heirs. Widowed daughter-in-law belongs to her in-laws, and widowed son-in-law belongs to her father-in-law and mother-in-law. Whether she remarries or not, it does not affect her children subrogation inheritance.
According to the situation you described, your second sister died young, and her children have the right to subrogation inheritance your father's property. Because your second sister's ex-husband remarried and failed to support your father, his ex-husband has no right to inherit your father's property.
As for how much share of your father's property your second sister's children can inherit, it needs to be judged according to the actual situation between you.
legal ground
Inheritance law:
Article 10 Heritage shall be inherited in the following order:
First order: spouse, children, parents.
The second order: brothers and sisters, grandparents, grandparents.
After the inheritance begins, the successor in the first order inherits, and the successor in the second order does not inherit. If there is no successor in the first order, it is inherited by the successor in the second order.
Children referred to in this Law include children born in wedlock, children born out of wedlock, adopted children and stepchildren with dependency.
Parents referred to in this Law include biological parents, adoptive parents and step parents who have a dependency relationship.
Brothers and sisters referred to in this Law include brothers and sisters of the same parents, half-brothers, adopted brothers and sisters and stepbrothers and sisters with dependent relationship.
Article 11 If the decedent's children died before the decedent, the descendants of the decedent's children shall be in subrogation inheritance. Generally speaking, subrogation inheritance people can only inherit the share of the inheritance that their father or mother has the right to inherit.
Article 12 A widowed daughter-in-law takes her father-in-law and her mother-in-law as the first heirs, and a widowed son-in-law takes her father-in-law and her mother-in-law as the first heirs.
Article 13 The shares of heirs in the same order shall generally be equal.
When distributing the inheritance, we should take care of the heirs who have special difficulties and lack the ability to work.
Heirs who have made major support obligations to the decedent or lived together with the decedent can get more points in the distribution of the estate.
If an heir who has the ability and conditions to support fails to perform the obligation of support, he shall not divide or divide the estate.
If the heirs agree through consultation, they may also be unequal.