Having a relative in canada and with an PR application mean that you will not leave canada after successful completion of your studies. This is very important to prove your country tie to them. Under the federal immigration act a VO is not permitted to issue study permit or TRV to someone who failed to prove that he/she will leave canada after their studies.
Sponsor's/ Relative + PR Application is indacating it very easily that you are not suppose to leave canada after your studies.
Around 80% students who get refuse from the Indian subcontinent get the same refusal reason : " I'm not satisfied that you've enough tie with your country of residence and you will definitely leave canada after finishing your studies "
So try to cut your uncle's sponsorship and there is no form where you've to indicate that you father had applied for PR in 2007
University doesn't matter unless it is a college or not, UT is well renowned and one of the best one but they don't deal with your offer letter but what they deal is your financial proofs and country. 1st one is easy to prove but for the second one you need to provide strong cover letter and ties ( Family, Property , job anything for what you will come back or you've to come back ) and after all it's up to allah, If it is in your destiny they you'll meet with your destiny.