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Hi guys I made a mistake the british application form.
After sending it off I realised I put my mothers DOB on the 5th it should have been the 9th
In my application for naturlisation I put it as the correct date the 9th.

I do have copies of my mothers passport, should I make the interviwer aware that the 5th was an accident and show the photocopy of my mums passport.

Also in the part about grand parents, I could not recall their dates of birth or marriage day and as my parents have passed away I could not ask so I left it unknown.

Will this be a problem?

Thanks in advance

Also in the part about grand parents, I could not recall their dates of birth or marriage day and as my parents have passed away I could not ask so I left it unknown.

Will this be a problem

?
No

Re DOB, you can explain to the passport office when you attend your interview.