This is a funny analogy I found in Mann Kee Awaaz Pratigya:
Lol, that rivalry between Thakurayin (Sumitra) and Pratigya is a classic, you can compare it to Barcelona vs Real Madrid or perhaps Keane vs Viera. I mean both of them hate each other so much that they're polar opposites. I guess Ganga was the third member in the rivalry between Thakurayin (Sumitra) and Pratigya, she became the Atletico Madrid, designated to break the duopoly rivalry. But Ganga had a specific rivalry with Thakurayin (Sumitra),Ganga became an obstacle to Thakurayin a bit like Real Madrid vs Atletico Madrid, fighting for the right as the best Madrid team in this case with Thakurayin (Sumitra) and Ganga, fighting for the right of the true Thakurayin. Also you can suggest that Ganga comes from a poor background and Thakurayin (Sumitra) comes from a rich background and we can see that Ganga wants to overthrow the rich Thakurayin. But as we all know the rivalry between Ganga and Thakurayin(Sumitra) is just a minor rivalry, it is nothing compared to the rivalry between Pratigya and Thakurayin (Sumitra), which has been going on since the show started. It is a rivalry between the mother in law and the daughter in law of the family and I'd like to call it the Thakur Classico!