Anupam shared the news on Twitter.
"Col. Thakur Singh, Kirron Ji's father departed for a better world this morning. He was one of the kindest persons I have ever met. Will miss him," Anupam tweeted.
Anupam also shared a photograph of his father-in-law with Kirron, and another in which he was in the frame too.
In May this year, Anupam had said he is "always happy" to meet Kirron's father and had then shared that he was 102 years old.