Looking towards technical minded relatives and friends definitely helped, but what really pushed Chrome over the top IMO was Google.com, Gmail, Youtube, Google Docs, Google Calendar, Hangouts, etc. all insisting you must use Chrome.
To explain why I think this, the Quality delta between Firefox and IE when Firefox reached about 20-30% marketshare was orders of magnitude greater than the delta between Chrome and Firefox over the period Chrome managed to push to 60-70% marketshare.
