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I want to fill in the passport correctly.
in section 4 they ask for full names, date of birth and marriage of your grandparents.

does it mean I have to write names, dates of birth for 4 my grandparents (2 my mother's parents and 2 my father's parents) and 2 dates of marriages?

what If I am not able to find the dates of marriages as it was over 90 years ago and there is no documents?

Why not checking the FAQ before posting?

Citizenship FAQs - Common Questions - Read before posting - Passport.

i checked faq n no info on this topic there

I suggest a visit to Specsavers.

Q1: Do I need to fill in the details about the grand parents? I don’t know their details

yes, I read Q1,answer as Faq states that the answer is to be found on page 12, I checked on page no 12 there is a table and no info on it.
PASSPORT FORM - in section 4 of the form if both parents were born after 1982 or were born abroad, we will need full name town country date of birth and marriage of your grandparents /or details of your parents claim to British nationailty/

Q1 says :

Q1: Do I need to fill in the details about the grand parents? I don’t know their details

The section about the grandparents in not required if you obtained BC by naturalisation (see page 12 of the guidance notes). It is required if you have obtained it though your parents/grandparents. Some PO C&S might insist you fill in that section. In that case, if you don’t know, write “unknown”. Just remember what you put in as you might be asked at the identity interview about those details.

i checked new guiide taken from PO , on page 12 there is no info about it, there are only tales not saying anything about grandparents issues

I read a few times booklet and form and it sounds if U gain a BC and your parents outside Uk, then they want grandparents details including date of marriage, it applies for those whose parents never gained BC and for those whose parent received BC

Page 12, Point 2, last row - When you have been natursalised as British - read along the columns across both page 12 and 13. It is clearly indicated with a cross and a tick what you need to supply and grandparent details in not one of them.

I got it, now thanks

if you are sending on your own, (without check and send)

then if you want to have documents back on special delivery for £3 then you buy an extra envelope with £3 postage to put along with a letter, application?
or u add on the payment slip £75.50 (72.50 fee and 3 special delivery back?)

How your documents will be sent back

Your documents will be sent back through the normal post.

You can pay an extra £3 to get your supporting documents sent back to you via secure delivery when your application has been processed.

Choose this service on your application form if you want to use it.

https://www.gov.uk/apply-first-adult-pa ... pplication