1. If the son of second wife is not legally adopted by your son he has no right in your son's property.

your son second wife child born out of her marriage with her first husband has no share in your son property 

No your son has no right , second wife and her son may claim property of her ex husband. 

1. Child of 2nd Wife has to legal right to claim any property rights of Son.

2. Child of 2nd Wife can claim property that belongs to or would belong to his Mother (2nd wife) and his biological Father.

No, None of son can claim opposite step father's property as a legal heirs. only Biological son can have right in the property or if the step father adopt the step son. mean your son adopt's the step son then he will have to give rights in the property otherwise not.

NO.

Child only had right if he was legally adopted by your son otherwise only his widow, child from previous marriage and mother if alive are legal heirs of deceased son and have eqaul right in property.

FIL of second wife has no claim.

Only if the child is adopted by your son then he will be eligible. The son can only claim share if such property belongs to his father

Dear Sir,

After marriage, the son will be treated as biological child as he may claim the property of the step father. 

The child belongs to the 2nd wife and unless your son adopts him he is not his son and so no share in the property.

Yes the step son and his wife is entitled to his dead father's property.

1. The the step child of your son has no relation with you as per the parameters mentioned in Hindu Succession Act.

2. the right of succession of this child from his biological father or grand father and you do not come within the scheme of Hindu Succession Act.

3. If your son doe snot aopt the child then he can not claim the property of the child as well nor the child from you. 

No, son of second wife from her first husband is not entitled to your son's property.  He has share in his Grand Father's share.

No, neither your son can claim property of second wife's son from her previous husband.

- As per the Hindu Succession Act, the child from his second wife's previous husband is not having any legal right to claim over the property of your son, and even your property ,  being the step son. 

- No, your son cannot claim property of second wife's son from her previous husband.

The child of the second son shall be your son's step son only meaning thereby, the step child is not entitled to any rights with the step father.

However his own biological child now in the custody of his ex-wife shall be entitled to his rights with your son as his biological son.

If your son is adopting the child of his second wife by legal adoption  by a registered adoption deed, then that adopted child shall be entitled  to all the rights with its adoptive father at par with the biological son of the adoptive father.

Your son's step son is entitled to a legitimate share out of his deceased father, left behind if any upon his intestate death.

The child's mother can fight for her son's rights in his biological father's properties.

No, he can't claim....

Make a registered will 

1. The biological child of his second wife born out of her first wedlock, unless adopted by your son, is not a legal heir of your son.

2. However, the child is a legal heir of his biological mother.

3. Your son cannot claim property on the behalf of his second wife's son.

Step son dont have rights in Step Father Property. 

Step Son can claim share in Biological father property. 

Your son cannot claim share for his step son from the biological father 

1. No child of second wife is not entitled to get property of your son if that child was not adopted officially by your son. 

2. No your son can also not claim property of that child.