Yes. Hey, I am not an only child, so they must have done it more than once!<br />
Seriously, Dad is 80 and Mom is late seventies and I know that they still enjoy sex. My family was always open about the facts of life, etc.
Not any more, as both are dead...but they had a number of children and used to sometimes be playful with each other when I was young, so I could easily imagine them doing so back then.
No. Dad is dead.
I asked them and they promised me they have never had sex.
They hate each others guts so nopes.