A Number of Green Card of children and mother in my N-400 form

[Sneha B]

I am applying for Citizenship-form N-400 (I am filling in the N-400 online) as I have completed 5 years as a Perm Resident.  The form requires me to provide details of my children and asks for their Green Card A number.  Both my children are already US citizens so technically their Alien number on the GC should be 'invalid'.    There is an option to check the box that says- "Does not have an A number".  Should I check this box and not provide a Alien number or should I provide it though they are citizens.?

Similarly the form asks for my parents' citizenship status.  My mother is a US citizen.  The form asks for her naturalization date And then goes on to ask what her GC Alien number is.  Again should i provide an "A" number or check the box that says "My mother does not have a A number"

 

[JoeF]

Check that box. They don't have an A# anymore.