Little Brother = chhota(little) brother(bhai) Might be it is not easy for you to pronounce "chhota" as it is .But you will get hint from these hindi character छोटा -> Little (chhota) भाई-> brother (bhai) Have a nice day!!

it is not little brother but younger brother and you refer to them as chota bhai and in case of younger sister choti behan. P.S. shukriya is an urdu word though most indians know that. dhanyawad is proper hindi word but rarely used.

well little brother is called ANUJ and big brother is called BHARATHA OR JEST BHARATHA . and one should always use shree when addresing elder brother. like bharatha shree.

little--> chota(छोटा ) brother-->bhai(भाई ) whereas older brother can be written as older( bade,बड़े) brother(bhai,भाई)... in the same way sister(behan ,बहन) ..!!