Nilambara Cakravarti, the grandfather of Sri Caitanya Mahaprabhu, was very intimately related to Raghunatha dasa's father and uncle. Nilambara Cakravarti used to call them his younger brothers because both of them were very devoted to the brahmanas and were very respectable gentlemen. Similarly, they used to call him Dada Cakravarti, addressing him as an elder brother brahmana. Raghunatha dasa, however, was almost the same age as Lord Sri Caitanya Mahaprabhu. Generally a grandchild may joke about his grandfather. Therefore Sri Caitanya Mahaprabhu took advantage of the relationship between His grandfather and Raghunatha dasa's father and uncle to speak in a joking way.