It is especially known for the white spongy form of rossogolla in Bengal, invented by the founder's ancestor, Nobin Chandra Das.

His son, Sarada Charan Das, incorporated and established the family enterprise as K.C.Das Private Limited and was primarily responsible for driving the explosive growth in business.

In 1955, Sarada Charan had a major disagreement with his second son, Debendra Nath Das, which led to a permanent estrangement within the family.

[7][circular reference] Debendra Nath Das chose to step out of the family and established his own Indian confectionery store in Kalighat, naming it as "K. C. Das Grandson" after his late grandfather.

Das Grandson's products are not only used widely in Bengal, but also exported to many countries like UK, United States, Bangladesh.