...should I do? but please dont ask me to let him watch the 'Get a Mac' commercial.
I told him Mac won't be affected by virus but he just won't listen.

Listen to yr old man. If u r paying then it is a difference story.

explain to him that more people are getting macs every year and that if you want your computer to last you'll have to get a mac because in a few years everyone will have one. Not necessarily true but whatever.

note: I use linux, it is awesome.