How should one address family members in Hindi or Bengali? What about etiquette?

Question

What's the proper way to address one's family members in either Hindi or Bengali? (Specific words, please?) Is there a less formal form, as in English? ("Mom" instead of "mother", "dad" instead of "father".) Also, does anyone have any general etiquette tips for West Bengal?

Answer 1

Best Answer - Chosen by Voters

In Hindi:

father - papa
mother - mumy
older brother - bhaisaab
younger brother - bhaiya
older sister - didi
grandfather (dad's side) - dada
grandfather (mom's side) - nana
grandmother (dad's side) - dadi
grandmother (mom's side) - nani

Answer 2

mother--maa
father--baba
brother-dada
sister- didi

Answer 3

in bengali:
mother- maa
father- baba
sister- didi
brother- dada

in hindi:
mother- maa
father- papa
brother- bhaiya
sister- didi
uncle - chacha
aunt- chachi
grandfather- dada
grandmother- dadi