Do children of parents who became US citizens in the mid 70s automatically considered citizens if the child was underage at the time? Or is further action required? I've been told yes and others not so sure.

I believe the answer to that woud be if the children were included in the origianl paperwork for the parents. If you could provide more information that would be good. Such as country from, what status did they adjust under, and if the children originally came with the parents to the US.