Guidance on how to file son's W2

My son who turned 18 got his W2 for his part time job from his employer. Till now I have claimed him as dependent on married filing jointly along with my spouse. I am currently in the 22% tax bracket. His earnings from his part time job are less than $2000.

  1. Should I add his W2 to my taxes or should he be doing his own taxes ?
  2. If he does his own taxes should I still include him as dependent ?
  3. Assume that he needs to file his own taxes since he got his W2 even though the income is pretty low.

Thanks