Hello and welcome Atif Kamal from a fellow Karachiite, Ali/Captain. I've got my greys in the house for the last 2 years now, and I've got two children, one of them had been treated for asthma in the past but I have no problems, none whatsoever, relating to getting any flu or other disease from my birds.
We would be happy to learn more about your grey. If you need my assistance about where to get the feed, cage, etc. please do not hesitate to drop me a private message so that 'somebody' on the forum should not threaten to fiddling with my buttons (don't worry too much about the last remarks, they understood, whom these were addressed to).