Mood: The mood of the video seems to be emotional and heartwarming, focusing on the bond between a mother and son. The theme appears to revolve around family, love, and possibly nostalgia, given the title 'Mother Song' and the tagline 'Soul of Varisu'. The overall emotion conveyed is sentimental and touching.

Environment: The setting appears to be outdoors, possibly in a residential area or a quiet neighborhood, indicated by the presence of trees and a building in the background. The soft lighting and the serene backdrop suggest a calm and peaceful environment, which complements the emotional theme of the video.