you can certainly take kids and family to hilly areas. i've seen many families with kids there.
it all really depends on what you intend to do when there. if you want to take it easy and safe then it should be fine. but i wouldn't suggest doing adventurist stuff with 8 months old kid in the back seat. definitely a no no.
and never go offroading alone, always have atleast another vehicle to pull/push or help you out.