Baa and Gurnam played a couple in Tara. Gurnam's character in Tara (don't remember his name in the serial) was sort of a casanova dating several girls. They at least showed 3 including Sheena who was one of the main leads.
And here they have made Baa as sort of Gurnam's mother (well not directly but in age).
Too bad that our telly-industry has very few age appropriate roles for middle aged characters.