Okie, it has been a very very long time since I posted anything and Mehak keeps demanding a new post. So here I go.
I was just sitting and a thought came to my mind. Did you even notice - How most of the names given to relationships are rhyming and 2 syllables. For example - pa...pa(papa), mu... my(mummy), cha.....cha(chacha), cha....chi(chachi),ma...ma(mama), ma....mi(mami), da...da(dada), da...di(dadi), na....na(nana), na...ni(nani)....and so on and so forth. Male relationship names always end with an 'aa' and female with 'ee'.
Maybe our old ancestors one day sat in a gathering and gave names to all relationships in one go or maybe the names gradually evolved over time. So, it could have been that instead of calling your mama as mama and mami as mami, we might have been calling them by the names of rara or rari or maybe lala or lali or maybe fafa or fafi. Seems funny. Try calling your mama by the name of rara and it seems totally absurd, but it could have been true that rara could had been the name given. Same is the case with other relationship names.
Maybe we have been associating names with people and relationships since childhood, so we get used to the names.

There is a saying - "A Rose would be a Rose, by whatever name it's called". Try calling it by a name say - 'ooku' or whatever comes to your mind and see what happens!