Aquinas, in theory I totally agree. My dodging of a more frank discussion have to do with my son being extremely outgoing and too young really understand the need for discretion in speaking about certain topics.

For example I could totally see him happily and loudly exclaiming upon meeting a family with siblings who have different dads, "Wow! So that means your mom let a different man ejaculate inside her every other year. That is really interesting. Did the first dad die or something or did she just not like how the kid they made turned out?"

I am hoping by the time we have that talk, he has a better filter. Unfortunately "lack of filter" runs in the family.