Prime Minister Indira Gandhi and Chief Minister of West Bengal Siddhartha Shankar Ray at a Music concert presented by the Calcutta Youth choir at Teen Murti House (Nehru Memorial Museum) on the occasion of the 9th death anniversary of Jawaharlal Nehru, on May 27, 1973. The little boy with Mrs Gandhi probably Rahul Gandhi who was 3 years old then.
Source: photodivision.gov.in