RADDS-R and Social Communication Questionnaire

It’s now been 7 months since seeing my gp for a referral. I completed an AQ10 and a questionnaire which has now been processed. I have now received a more detailed questionnaire in the form of a Radds-r and general background form that’s straightforward enough 

I’m really struggling with the Social Communication questionnaire, it needs to be filled out by someone who knew me as a child. I’m 55 soon and have one surviving parent. My mother is 76 and really doesn’t acknowledge my autism, she can’t even use the words autistic / autism. I’ve tried to slowly let her in but she comes back with her proof that I’m normal. I just know she is going to mess up my chances of a diagnosis. She will bring school workbooks to my house to show that I was normal. I have asked if she knew that I was actually in special lessons as I wouldn’t bond with others. She was totally unaware. Some of my childhood was spent living with relatives as my mother would  be sectioned under the mental health act.

My sister is 10 years younger than me so doesn’t really remember much. I don’t have much of a paper trail, I just kept my head down as a child and stayed under the radar. My wife has known me since I was 19 and is a long serving NHS nurse she sees the struggles I’ve always had as she has  born the brunt of many of my meltdowns. Any ideas would be helpful.