Kindly clarify whether your father predeceased your grandmother

2) grandmother is legal heir to your father property

3) on grandmother demise her legal heirs can claim grandmother share in father property

Yes they would inherit the share of grandmother

1.The legal heirs of a person can claim only the ancestral proeprty of their predecessor in interest.

2. So all those properties which were acquired by your father through his own endevour can not be claimed by his brother and sisters.

3/ Similar is in the case of your grand mother.

1. If your question is with respect to the inheritance to the property of your father then on his demise his property has devolved through succession on his widow and children if he died intestate.

2. The heirs of your father alone succeed to his property.

My father , grand mother and grand father passed away two years before. please let me know grand mother legal heir will able to claim my father property which earned by own

If your grandmother has any legal heirs surviving her death other than your father's heirs, they also would be entitled to a share out of her share in the property that was left behind by your father or out of her own property.

ie propery in name of my father is able to claim by grand mother legal heir ?

Yes, your deceased grandmother's share out of yor deceased father's property shall devolve on all her legal heirs which would include your father's share vesting on his own legal heirs, i.e, you, your mother and siblings.

if grandmother hiers no more then hiers of grandsmother hiers will able to cliam my father property ?

Your grandmother's heirs will consist her own sons and daughters, or their heirs in case they have died