I've been reading this thread for a few days, hesitating over whether to post or not since I don't have children and have had my current--and only--rabbit just since September 28. (I've had cats all my life and Bernese Mtn. Dogs since 1998, though.)
I did try to adopt a rabbit from the local HRS chapter in late July/early August. When I went for a visit to the potential adoptee, HRS put her in an ex-pen in their "meeting/greeting room" and started a DVD playing, even though I said that I couldn't stay to watch it and would have to leave soon.
I saw enough of the DVD to view HRS's recommendation on rabbits for families with children, though. They used an analogy: "If you don't expect your young children to pick up the family dog, why expect them to pick up the family rabbit?" Then HRS showed a family dog (Golden Retriever, IIRC, so sweet

) lying on the living-room carpet next to a maybe 4-year-old little boy *and* a 12- to 14-lb rabbit, judging from its size next to the Golden and the little boy. It wasn't a Flemish and it wasn't a Checkered Giant, but it *was* a Big Rabbit.
So that might be one way to look at things, courtesy of the HRS.