BRP Renewal for minor

Hi, I've submitted application for my son's BRP card renewal and got an appointment for biometrics next week. One of the required document is to prove continuous residency in the UK since becoming a permanent resident:

"The document(s) you provide must cover every year since you became a permanent resident. Example
documents include: council tax letters; letter(s) from a GP confirming dates of attendance; letter(s) from a
school or college confirming dates of attendance; electricity, gas or water bills; or letter(s) from employer(s)
confirming employment"

As applicant is minor, I dont think I can submit council tax letters and other utility bills??? So the other options are letter from the school or GP (not sure how they provide this as we visited them rarely).

I wonder if they accept passport as evidence as it has all the stamps when we visited overseas? Does anyone applied for renewing BRP for minor? If so, please let me know what document you've submitted to prove continuous residency?

Thanks