childhood stuff

Does anyone have an opinion on this?
There are things that happened in my childhood that I want to know more about. The only way to find out is to go through 1) people who are more than willing to block any knowledge about it, and/or ask 2) people who are very vulnerable and were involved in it. This latter category is just as liable to alter or erase information as the first, yet because of their involvement I can more accurately gauge the truth from their responses. Should I ask them and risk retraumatizing them? Or ignore it and go on not knowing, despite thinking that knowing might help me?
I appreciate any perspective

I sat down one day at my word processor and made a list of questionable occurrences aka my childhood, then started writing about each one. I was surprised at how much i remembered. Maybe try that? Ive tried talking to my brother and my parents - they dont remember things that were important to me, and they see things the way they want to, in a way that favors them, so i doubt that would be helpful. Even my t wasnt very helpful - he didnt like me "dwelling" on carp. I grew up feeling like everybody knew something except me - i wasnot happy when i figured it out, but it sure explained a LOT about things people said, and about how even my own parents treated me.

I was able to talk a bit to my younger sister about the childhood stuff and she corrobated some of my memories even though she was a year younger than I was (I was 5 at the time). My aunt who was there at the time claims amnesia of the entire event even though both my sister & I remember a rowing arugument between my aunt & uncle that time when they were supposed to be babysitting us. The uncle was just always weird, he said really uncomfortable stuff to me as a teenager that I DO remember. After that babysitting incident, my mom never let that aunt & uncle babysit us again because both my sister & I were hysterical by the time she picked us up. I unfortunately did see the uncle even after my aunt divorced him because I lived in a very small town. And he had the gall to show up at my house on graduation night with a "gift" for me that I threw away the second he left. My mom and my other aunt (the sisters of the amnesiac aunt) remember strange and weird things about the uncle too while they were teenagers and my aunt was dating him. Neither of them doubt my memory; both have told me so.