Short Answer: Yes
Long Answer: Happiness is dependent on various factors. Some people think if they have a lots of money they will be happy. But usually money comes with all sort of problems. For some people happiness is spending time with family. Some people find happiness in making others happy. It is relative and is also variable.
Happiness is a situational thing. Based on the situation our happiness will also change. It is definitely not possible for anyone to be happy all the time. The definition of happiness will change from one person to another person.
