Telegram shows contacts from different phone? Recently I installed Telegram on my SGS3 and surprisingly the Telegram contacts show me the contacts from my father's phone!!!! My father has an SGS2.

By the way, on my SGS3 the "Contacts to Display" option is set to show 'Gmail account', and none of my father's lists are there.

Who can explain this?
Probably you have both google accounts (yours and your father's) synched with your phone OR you are  running Telegram with the same phone numbers.