Will the parent cockatiel have anything to do with the young cockatiel if i touch the young cockatiel?

the parent cockatiels will protect their youngster no matter what is in their way

they will even die to protect their baby[s]

It is inadvisable to touch a very young cockatiel. Sometimes the parent bird will reject the young chick if it has been touched by humans. Wait until the bird is a young fledgling, as this is a safer time.