Probably the wife and the mother-in-law…. 😉  Two by one is a play on a a regular Indian expression, One by Two, where we love to share with our friends, relatives and companions.  One by Two literally means something shared fifty-fifty.  So if you happen to step into an eatery and ask for a coffee one-by-two, the waiter will bring you one coffee and an empty cup so you can share it.  This is India Only!