My father is and always been a fighter, he is slowly responding to medical interventions: Pranab Mukherjee's son

"My father is & has always been a fighter! He is slowly responding to medical interventions & all his vital parameters are stable. I urge upon every well-wisher to pray for my father's speedy recovery! We need them," tweeted Pranab Mukherjee's son Abhijit Mukherjee.