When you are speaking of or for yourself, use "am." When you are talking about a person or a thing (in the singular), use "is." When you are talking to a person, and when you are talking about other people or things (in the plural), use "are."
Here, it is plural. Hence, are will be used.
Kites . . . . . . by Children, adult, girls and boys in India.
Sentence is in present continuous tense with passive voice.
Subject + is/am/are + being + V3 + other agents. Listen, an announcement is being made to cancel all the flights due to heavy ice-fall.