V.P.
Highland Shores in Highland Village has 2 haunted houses...
Haunted Trails Jr. for kids under 12, and Haunted Trails, "recommended for kids 12 and up." (but kids under 12 can get in with a parent). I've never been, but the regular one sounds like what you're looking for. They've been doing it for years, so it's very popular:) Details at: http://www.highlandshores.net/
Castle Hills Haunted House:
I've never been to this one either (I think this is only their 2nd year), but it might be worth checking out: http://www.castlehills.com/events.php. Castle Hills on the northeast side of Carrollton.
Hall's Pumpkin Farm
I know this isn't a haunted house, but I'm planning on bringing my 10 & 12 yr olds (and some of their friends) to the Corn Maze. It covers 2 acres, and you can do it after dark, which sounds kind of spooky:) Details are here: http://familyeguide.com/Halls-Pumpkin-Farm.html.
Good luck!