A “children’s film” is a film where the intended prinary audience is children. Toy Story and it’s sequels are children’s films, but they are very good ones because they don’t pander to the children. Because they don’t pander to them, there are more mature underlying themes and ideas. Some they’ll pick up on, some they won’t at first but will later in life should they choose to rewatch them, making the films even more special to them and their memories of childhood. So it won’t be eventually forgotten as silly old trash like, say, Minions will eventually.