Have namechanged.
Wasn't sure where to put this but wanted lots of opinions because I'm not sure what normal behaviour is for boys this age.
Anyway, to cut to the chase, DSS(10) and DS(5) still get in the bath together usually when DSS is with us. Tonight I went into the bathroom and saw that DS was holding DSS's penis and appeared to be squeezing it. DS is uninhibited like kids of that age are, always shedding clothes and running around naked; he plays with his own penis unselfconsciously. We just tell him it is private but don't make a big deal out of it.
I have told DH about it and asked him to have 'a talk' with DSS. He seemed a bit reluctant but i insisted - DH has never had any kind of birds and bees talk with DSS but is also sure that DSS's mum won't have, either. He asked what he should say so I told him to ask what DSS knew about sex already and work from there - with a focus on genitals being private/not letting anyone touch.
I don't need to worry about this, right?