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

I Hope it will not being asked of me if I get to the point of having assessment. I could use only my husband who knows me only 6 years, my parents or siblings - absolutely not. In fact they often tell me that I live in my own world, that I’m do funny because I understand everything or at least most of things literally and how awkward I am how a loner I a as m without friends etc. but my mom was told by my teachers in primary school that I’m most probably autistic and she should have had me assessed. She denied the idea of having a “defective” daughter and ignored my teachers, my problems, my meltdowns etc. so she is the last person who I would have ever asked for involvement in my assessment. My both father and step father were abusive and toxic, so also no. There is one more problem- even if I have found anyone in my family who knew me in my childhood and would be willing to help me, I would have needed a translator because I’m living abroad’s. 
but as far as I know the involvement of a family member is not necessary. Maybe I’m wrong or maybe the procedure varies in different countries. And if I ever get the diagnosis, I will announce it here in the forum and will share my feelings and thoughts around it. But my family will never know about it. They just broke my trust enough. 

I Hope it will not being asked of me if I get to the point of having assessment. I could use only my husband who knows me only 6 years, my parents or siblings - absolutely not. In fact they often tell me that I live in my own world, that I’m do funny because I understand everything or at least most of things literally and how awkward I am how a loner I a as m without friends etc. but my mom was told by my teachers in primary school that I’m most probably autistic and she should have had me assessed. She denied the idea of having a “defective” daughter and ignored my teachers, my problems, my meltdowns etc. so she is the last person who I would have ever asked for involvement in my assessment. My both father and step father were abusive and toxic, so also no. There is one more problem- even if I have found anyone in my family who knew me in my childhood and would be willing to help me, I would have needed a translator because I’m living abroad’s. 
but as far as I know the involvement of a family member is not necessary. Maybe I’m wrong or maybe the procedure varies in different countries. And if I ever get the diagnosis, I will announce it here in the forum and will share my feelings and thoughts around it. But my family will never know about it. They just broke my trust enough.