I swear, honest truth. As Dim, I told her about it ages ago.
I think if I'd known at the time it would have been a complete brain thrash, but I was thirty when I found out so I could see the funny side of it as my mom descibed how she found out.
She was actually rather drunk when she told me, but did confirm it all when a little more sober a few days later.
oh, my, RC, what did you think, after your mom confirmed it later? Did you think back on maybe some "interesting" events that occurred way back then, that you now understand better? maybe like your dad enjoyed shopping for your mom's clothes? little subtle stuff that really weren't any big deal back then, but now look different in light of everything?