Exactly...legalities come into play around how the information is obtained (hacking, social engineering, privileged access, etc) and also how the information is used. The information in question is publicly available and requires no approval or connection to permit access...it is truly public information for everyone to see and use.
Now, if someone took that information to aide in their stalking or revealing more information then the act of doing that would be illegal as it presents an existential threat. Posting the data about yourself or those in your legal care assumes that you understand the potential risks that come with that.
Use the imdb page as a reference to make some point, any point, is not illegal. It might be argued that this was done open up harassment against the boy, but that hasn't happened and the information in the imdb page (or any imdb page) is not sufficeint to launch such an attack.
But really, why are we going on about this again. It came up like two version of this thread before and it always comes to the same conclusion...
It wasn't cool for DS to bring the kid in it, but he did for the purpose of proving the CR and Sandi relationship that was being denied, at the time. It is a reference that provides irrefutable proof for the point DS was making. I don't like it, since I don't think nepotism should be that much a surprise here but it was used as a reference, that is all.
Nothing bad has happened to the kid...so we are just going 'round and 'round over milk that wasn't even spilled.
Let's just forget the kid going forward since it is well established now that CR and Sandi are a family unit.