When seeking a diagnosis is it essential to have input from someone who knew me in childhood?

Thanks to everyone who responded to my previous question. I got looks of helpful answers.

My next question is about having an assessment. 

I have read that assessments ask for information from someone who knew me when I was a child. My problem is that I can't think of anyone who I could ask to do this. There are reasons why I don't not think either of my parents would be suitable options.

Is it a necessary part of an assessment for diagnosis to have information from someone who knew me in childhood? Is it even worth bothering asking my GP about seeking diagnosis if I know that when they ask me about this I already know there is no one to ask?

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