My family saw this with extended family. I really enjoyed the movie, BUT this is not the feel good family movie of the year. Just because a movie is PG does not make it a good children/family movie. It deals with a lot of adult issues and the focus is not the zoo/animals. It has a couple of language spots (nothing that my kids have not heard, but it is arguments between father and young son/boy). It may sound foolish but my biggest beef was a statement about the EASTER BUNNY not being REAL.
Overall - I really enjoyed it but I wish that I had not take my kids. Kids grow up too fast already without a movie giving them things to worry about (terminal illness, financial woes, etc...)