how can you risk that mate
do you have any sense, sorry to be straight to the point but your putting your self and dad at risk!
if your tyre has a punure and you have ran it flat then the tyre is scrap plain and simple
what happens is when that tyre is taken off the rim you will find shit loads of rubber inside do it it wearing on the inside rather than the tread on the tyre, so it could blow out at any god given time
i would get the wheel off and put the/a sparer on it mate
dont drive on that tyre its not worth the risk