Hi furyblaze. What your Dad might be referring to is that his corporate IT department may not allow certain third party applications to be loaded on their BlackBerry. If that is the case, it is not possible and you and he won't want to try to circumvent a policy of his employer.
if you find that you can do so... look here first:
3rd Party Application List - BlackBerryFAQ.com
and at mobile.blackberry.com