Relatives ID n Passwords appearing in my Browser!!?

Weird thing happened a few days back, I opened my gmail account and as I was about to enter my id, my father's, sister's and niece's id appeared WITH PASSWORDS, same happened when I opened Facebook !!! and again the same thing happened when I opened yahoo mail, but this time only IDs appeared. They... show more Weird thing happened a few days back, I opened my gmail account and as I was about to enter my id, my father's, sister's and niece's id appeared WITH PASSWORDS, same happened when I opened Facebook !!! and again the same thing happened when I opened yahoo mail, but this time only IDs appeared.
They live in another city, and though I visit them, but I have never.. repeat.. never taken my laptop there!!
I'm surprised that how is this possible and no random IDs are appearing but my relatives only!!

I'm using Google Chrome; Windows 7 ultimate
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