The House is in our possesion.
please help me in this issue, since the title is my grand mother everybody saying she is absolute owner of property, please help with the reference cases where the Judiciary looked into the source rather than title of the property.
The house may be in your possession owing to the your residence in it.
It does not means that this property belongs to you.
This property might have been bought by your father but what prevented him from not registering it in his wife's name (because the source of fund is his wife) or on his own name?
Since the property is still standing on your deceased grandmother's name, it shall devolve equally upon all her own legal heirs and since your deceased father was one among the legal heirs, his one such equal share shall devolve on his own legal heirs i.e., you, your mother and your siblings.
If you want to secure the property by yourself, you can buy the shares of other co-sharers.
Legally there is nothing to fight against it, so it may be a waste of time, money and energy if you fight against it legally.