Asbestos problem... Don't know how to convince my dad that it's not healthy.?

Question by : Asbestos problem... Don't know how to convince my dad that it's not healthy.?
Okay, I consider myself a fairly educated person, with a broad general knowledge..
I'm aware that asbestos is pretty dangerous.. But, even after reading goverment workspace regulations and security procedures, I'm still a bit confuzed here..

My problem:
We're building rooms on the second floor of our house, and our ancient roof is of the "good olden asbestos" type.
We need to put in vents, and I'm

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