I felt so delicate to bring this point. Rather I would have Posted this much earlier.
Don't be sorry... You brought up correct point..
Even I am aware of these kind of marriages... Bua ke bete se shadi is very common and as per my knowledge prevalent in all of India..
Mama- bhanji is restricted to South India only again according to my knowledge... N I think it is still a practice among underprivileged people.. i have seen such young couples who are house helpers, labours..