Parents & granparents info in the passport application for a

Anyone can explain me this?

In the passport application thare is a section 4 where one write details about their parents Iincluding hte marriage date).

The booklet also says that if the parents were born outside the UK, the grandparents' info must be written in Section 8.

Apparently, this is to prove one's citizenship by descent.

So, as a freshly naturalised citizen, will I have to write the details of my parents and grandparents (none of them having anything to do with the UK or the British empire), or may I leave at least Section 8 blank?

I also don't know the exaxct date of my parents' marriage. They have divorced a very long time ago, and all i can get is the year month and - tentatively - the month. what should i write there? Make up the day of the month? Or "just he facts, ma'am"?

Include parents details. If you don't know the marriage date you can write 'detail not known'

You don't need to include grandparents details.