If it wasn't for my Dad I probably wouldn't have a gaming hobby. He got us our first ZX Spectrum 29 years ago when I was 4, and took me down to the arcades when I was about 6 (if it wasn't for those arcades I wouldn't love Bayonetta so much); he introduced me to the PC and PC gaming (which mostly consisted of Wolfenstein, Doom and Dune 2) when I was 13, and emulation of that Spectrum at 15. I helped him build his new PC when I was 17, he e-mailed me games and Speccy remakes to play on the PCs at university, he built me my own at 20. He kept introducing new games to me whenever I visited him throughout my 20s; he still loves the original WW2 based Call Of Duty games, and most of the Need For Speeds. I rung him tonight to talk about Father's Day and my new build and Bioshock Infinite. (He loves the game, but remains annoyed that Elizabeth can pick up ammo and health for you but can't collect her own lockpicks.)
It was his hobby first, and then it was our hobby. And it still is. (Although that formative Spectrum time is almost certainly why neither of us have ever been that impressed with consoles; he wrote a few Spectrum games and got one of our neighbours to do music for them. He even sent one to a publisher, although they turned it down.) My mother always hated it, and if I hadn't got into gaming before their divorce when I was 8 then I'm pretty sure she would have ensured that I never did.