So dd1 (six) said to dh tonight "My classmates say FC doesn't exist - tell me the truth, I know you would never lie to me"
dh left the room under a pretext and by the time he got back she had forgotten about it.
So I guess this is it isn't it? We'll have to tell her when she asks again won't we?
Just hope she can keep the secret for dd2 (and ds eventually)