Gender

[kahala.livejournal.com]

I know this will make Russian speakers laugh; it's a very silly question. Also, apologies - I'm on a work computer, and it doesn't seem to do Cyrillic fonts.

If I refer to Papa, or Vanya, or any other definitively masculine object with a feminine-sounding diminutive, would I say 'moy papa' or 'moya papa'? ie, does the gender flip according to the word, or not?

Thankyou...