It seems to me that I see here a happy family which consisnts of 4 people. Definitely they have a warm relationships between each other. I'd like to say that they smile and feel good except their son. There's a high probability that he is sad because he thinks that his parents don't pay him enough attention. Well, he believes in it and feels lonly. To my mind it isn't true because they love him like their daughter. In their family parents have a shiny eyes which full of kindess so I don't think that they'll divide their children into pets. As we see this girl try to commuticate with brother and make him happy.