Neena Gupta plays an ailing 92-year-old granny—Sardar Rupinder Kaur, the matriarchal head of a joint family in Amritsar—in Sardar Ka Grandson, which premiered on Netflix. Like her previous project Badhaai Ho—a mother in her 50s who ends up with an unplanned pregnancy—her latest role reflects her versatility. Neena speaks to Lachmi Deb Roy…