My dad said something wierd and I can't get it out of my head
I don't even know if this is the right place for this. I want to start off by saying I am a teenager who comes from a "no secrets" family. We're quite close, though I don't share exactly the same beleifs as my family. This being said, I recently (about 6 months ago) descovered something about my dad. He's autistic, and has really bad PTSD from working as a firefighter when I was a baby, so he gets frustrated and yells easily, though he always apologises afterwards. Anyways, we were on holiday with me, my mam, my dad, my sister, my grandfather and grandmother on both sides of my family, when my dad said something strange. I don't remember exactly what it was, but it was along the lines of "yeah, (my mothers name), but they (grandparents) don't know what it's like being tied up as a minor" then my mother gave him a look and gestured towards me. My dad later told me that he would tell me "when I'm older" which usually does mean he will tell me, but this feels like he doesn't want to, and is hoping I'll forget.
I guess, what I want to know, is how the hell do I go about looking for possible information on this? I've already searched things such as "child kidnappings [fathers childhood town] 1980-1990s" as well as variations including my fathers full name. So what's your advice?