Inheritance of property

A. In your case, your grandmother acquired some property through her mother would be treated as her absolute property under Sridhana as per the Hindu sucession Act.

B. Being an absolute owner of the property that she sold the same to your uncle. Whether it is registered or not is still arcane? However, it can be presumed that it might be exeucted by way of registration after verifying your question i.e, appeal preferred over lower court verdict.

C. Therefore, Sale Deed executed by grandmother is vaild and your father cannot question the same. And Court will not give any stay order in favour of your father.

Hi, sale deed executed by your grandmother in favour of your uncle is valid as it is the Stridhan property and she is the absolute owner of the property so she can sell the property to anybody she wants and other have no right to question it.

1) if property was given to grandmother by her mother she would be absolute owner of the property 

2) there is no conditional gift deed executed by your great grand mother that property should devolve on her children

3) your grandmother would be free to dispose of all her property 

4) yiur father has no right on the property 

5) no stay would be granted by court 

 as grand daughter you have no share in the property 

The judgement of court will only be applicable to grand fathervproperty and not to grandmother property 

1. It is your grandmother who sold the property to your uncle. This property came to her through inheritance from her mother. Your father's brothers had no right in the property of your grandmother. The only persons who could challenge the sale by your grandmother are her brothers and sisters. During the lifetime of your grandmother her husband no right in the property.

2. Your father too cannot seek a stay against the property being used by them as he had no share in the property during the lifetime of his mother.

Basically the property in the hands of your grandmother becomes her own absolute property.  
She can dispose it in the manner she desires.
The sale deed executed by her to your paternal aunt's husband is legally valid
Neither your father nor anyone cannot claim any share in that property except if they prove their contention that it was mentioned in the settlement deed that this property shall devolve on the children of your grandmother and she cannot sell it.
The information you have shared that while settling her property by your grandmother's mother in her favor  have stated that this property shall devolve on all her children, if made as a claim without any proof to prove then it may be considered as a vexatious claim and can never stand ground to succeed.  Therefore prepare grounds in appeal strongly to substantiate the claim on that basis.