Stereotyped, absurdly evil rich people
These people are so far over the type selfish, cold and evil, there are like cardboard cut-out figures. I worked for a couple of families as a childcare provider when I was young and they could be somewhat unctuous at times, but no one--even the elite of the elite--are so consistently creepy as the X family.
There are some nice parts to this movie but its overall quality is compromised by the stupidity of the extreme caricature of the rich parents. Great actors Paul Giamatti and Laura Linney egregiously wasted on one-dimensional characters. Even the parents in "Mary Poppins" weren't so evil.