Formal:
* আপনার পিতা কে? (Aapnar pita ke?) - This is the most formal and respectful way to ask.
* আপনার বাবা কে? (Aapnar baba ke?) - This is slightly less formal than the first option, but still polite.
Informal:
* তোমার বাবা কে? (Tomar baba ke?) - This is the most casual and informal way to ask.
More specific:
* আপনার পিতার নাম কি? (Aapnar pitar naam ki?) - This translates to "What is your father's name?".
* আপনার পিতা কী করেন? (Aapnar pita ki koren?) - This translates to "What does your father do?".
Remember to choose the appropriate phrase based on the situation and your relationship with the person you are asking.