I'm Diane, mom to Brian 10 and Katherine 8. They've both been homeschooled from birth. I've never had either kid tested for reading level, but I know they tend to read materials beyond their ages. We use (very loosely) Sonlight curriculum, and I think it's great for bright, avid readers.
Most homeschool activities allow for siblings--park days always do, and if a field trip isn't appropriate for little ones, it will be clearly stated in the information.