If you want to take a child or anyone with you; you may need to get a tandem seat kayak. But if you do that; you probably will not want to do any fishing.
I have a Malibu Mini Kayak 9'3" that weighs 40 pounds. You can get the Stealth in 12 or 14 foot 60 and 64 pounds. The price points are $650, $1,000 and $1,300. If you are talking about taking a child along and also fishing; you may both need to have your own kayaks. Don't know how old a child. For the price of one Hobie; you can get two of the Malibu kayaks and still have money left over to outfit them both how you want.
I am very happy with my Malibu kayak. I am not knocking other brands; but just food for thought.