I'm sure you've come across the saying, "When you know better, you do better," many times here on MDC. IMO, it's much easier to tell DS#1 that you made a mistake and didn't find out until later rather than having to explain it to both of them and that on top of that, in the case of DS#2, you already knew but still went ahead with it anyway.
Just FYI, my brother is circumcised while I'm not. It didn't become an issue until he had a son, and I tried to convince him not to circumcise.
Just FYI, my brother is circumcised while I'm not. It didn't become an issue until he had a son, and I tried to convince him not to circumcise.