A mondegreen is a word or phrase that is misunderstood at a later date and reanalyzed into something different by the speech community. The name comes from a line in an old Scottish ballad that goes “they killed the Earl of Moray/And laid him on the green” This was rephrased to “they killed the Earl of Moray/And Lady Mondegreen” (Cowan & Rakusan 1998).
Sās – bahū temple (सास – बहू मंदिर) in Gwalior, Madhya Pradesh is a mondegreen of Sahasra bāhu temple (सहस्रबाहु मंदिर). Sahasrabāhu (thousand handed) is an old name for lord Vishnu in Sanskrit, which was reanalyzed into Sās – bahū (mother in law – daughter in law) in Hindi. Built in 1092 by King Mahipala of the Kachchhapaghata (Kachchhwaha) dynasty, this temple is one of the greatest architectural marvels situated by Gwalior Fort. This is a pair of temples dedicated to Lord Vishnu and Lord Shiva. Local populace has rechristened these temples as of mother in law and daughter in law.
Google map of Sās – bahū temple