gift deed

Me maternal aunty died in dec 2009…she had a property in sialkot cantt…she then give gift deed on 100 rupees stamp paper dated july 2009 to my mother..
After she died we went to cantonment but before any process done.
My maternal uncle jumped in .
Then officials suggested us to civil court and seeking decree..
He also jumped in that case with 1/10..
There are 3 parties in the case like we ,cantonment board and my uncle.
Cantonment is silient before court and just waiting order.
Case began in 2010 and now both parties present their witness…
We got local witnesses like relatives and my uncle got unfamiliar and irrelevant witnesses. .
Stamp paper vendor also gave his statement. ..
Then on next date both parties were required to bring any documents if available.
Then we submitted original lease deed ,Id cards and tax receit etc
My uncle submitted nothing…
Then on next dates my uncle requested to call stamp vendor again because they thought there is a tempering ..
But requeste rejected by civil court and then session court and then uncle went to high court and court granted permission. .
Now we know as stamp vendor has recorded her statment earlier that my aunty bought herself the stamp paper.
Now they claim that there is a difference between back of stamp paper and register in one aspect like thumb impression on back of stamp paper and signs on register. ..

I want to ask now that
Can stamp paper vendor change his statement now ?
If he change what steps we should take ?
Whats the legal position favouring us