Given the emotion sadness and the tweet "My son 11 has 128 friends on Facebook and yet is moping around the house complaining he has no one to talk to. I'm right here son", classify the intensity of the emotion displayed in the tweet. The classification options are: 0: no sadness can be inferred, 1: low amount of sadness can be inferred, 2: moderate amount of sadness can be inferred, 3: high amount of sadness can be inferred.
1: low amount of sadness can be inferred