Since my father's attitude to video games is, to quote him directly, "only for kids - everyone grows the fuck out of them by the time they're twelve!" and that stretches to pretty much all animation (gee, I wonder why they gave that kids show a certificate 18?), webcomics and anything else that can be even remotely considered 'for children' at first glance, I'm going to say it wouldn't go over well - even if he never found the porn.
As for my mother, the video games, webcomics and what-not wouldn't bother her. The porn sure would, though. Once, I was Photoshopping a dildo onto a horse to create my very own 'pornicorn' forum avatar (y'know, for the lulz.) I accidentally saved the image of the dildo instead of just copying it, but, this being my own personal laptop, I just let it be and forgot about it. Sadly, the filename 'dildo-red7.jpg' caught my mother's attention when she borrowed my laptop a few weeks later. I don't think we talked to each other for several weeks afterwards - not because it was awkward, but she would immediately pull a "YOU'RE HORRIBLE AND PERVERTED AND SICK AND WRONG AND AHHHHHHHHH!" on me as soon as I opened my mouth.
"I'm 20, mother, and it wasn't even dirty! It was a advert for a sex toy, for Christ's sake."
Funny story, the same thing happened when she was browsing my music folder and came across Sublime's song Date Rape. Thank God she was tech-savvy enough to recognise an MP3 file and not instantly assume I was date raping women and filming it.