well i think being an only child effects the child very much
i happen to be a sort of only child
(all my siblings are by FAR older than me so i grew up alone with my parents)
i spent more time with my parents and benifited a lot from their wisdom on the other hand it was lonely
i traveled the world constantly with them and experienced more than my peers
my relationship with my siblings was hard i hardly saw them and they were more distant to me
but everyone is different