Does a 7 year old need their own visa application, or just be stated on the mothers application?

I was born in the UK and am British, when did I get permission to live in the UK I suppose I arrived on the day I was born.

For proof or relationship, do they want piles of papers with full transcripts of email and chat, or just a list of dates?

A lot of the questions are as clear as mud, and the guide helps you by saying "Please provide details as requested"

Any hints, particularly referring to the new form, would be appreciated.

Same goes for the supporting letter.

I thought I had seen most of this on the other website, but I can't find it, and many of the links seem to be dead