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

mother--maa

father--baba

brother-dada

sister- didi

Answer 2

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

Answer 3

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