I am not a parent: Far away from that at the moment! (I hope!) But I do share a house with my parents and two smaller sisters, aged 8 and 9. The 9 year old, a couple fo years ago asked me to do a reading for her, and with Mum's permission I did one. But I found it was very difficult to get the concepts of Tarot across to her, cuz she has bascailly been conditioned by the school she goes to to think that Tarot is evil. For example, one day, she came home and sat down next to me, hugged me, and asked me if I was going to Hell! I asked her why she thought that, and apparently the school had given an assembly, and invited two Born Again Christians (No offense to any Christians or Catholics: I'm sure you guys aren't like these ones....) who basically told the kids that if they didn't worship Jesus and the Christian God, they were going to Hell, and that if they did anything that they thought was wrong, including going to a fortune teller, they would go to Hell..... (I know not all Christians are like this, and that most Christians are really great people, but, as with all other religions, tehre are always the odd few wh manage to spoil it for the others.)
So my sisters are very diffcult to read for, cuz, even though they are still young, they already have those mental blosk which the rest of the posters on this topic found to be non-existent .... I guess you guys are the lucky ones.
Because of this experience, I don't think I would do a reading for anyone until they reach the age of about 13 or 14. Mainly cuz at this age, there is something going on in their lives to consult the cards about, but also cuz this is the age where we begin to break away from perviosu thought patterns, and explore. I am not too far away from this age (17) so I definitely don't believe in not doing readings for people under the age of 18! (It just wouldn't make sense!)
Just my thoughts...
Kiama