Ask HN: What is the safest way to store passwords online?

I have used an online scratchpad. After initially being unsure of Roboform, I have finally given and have started using Roboform. Have there been any hacks or password breaches in Roboform? Are there any other options out there? p.s. I have tried the open-source KeePass. I have also worked in the strong authentication industry (using PKI) for three years- so I do understand AES, key-exchanges, etc. I am really looking for a solution which also my father could use (he is 60 yrs old).