Especially if you don't know his sister personally yet, it's more likely that he will refer to her as "my sister" because you are not able to link a person to the name yet, while "my sister" does tell you something about who he is talking about. It's absolutely normal to do so and doesn't need a real reason.
You would say "petite sœur" in French to refer to a younger sister.
In Hawaiian, you would refer to your little sister as "kaikaina," which means "younger sibling."
"Dongsaeng" is a Korean term that refers to a younger sibling or a younger person who is close in age to the speaker. It is commonly used to address or refer to a younger brother or sister, as well as friends or colleagues who are younger.
"Mei mei" in Chinese means younger sister. It is a term used to refer to a girl who is younger than the speaker.
"Maninha" is Portuguese slang and it is an affectionate term used to refer to a female friend or sister. It is similar to saying "sis" or "buddy" in English.
"Babai" in Telugu is a term used to refer to one's father's younger brother or a paternal uncle. It is a common term of address and respect for male relatives in the family.
Well, i don't know if you've already been getting signs from him, but my friend's older brother likes to talk to me when i hang out with his sister. He doesn't talk about me to his sister or my friends.. but he does refer to me by my name. He tries to make me laugh alot too. haha I'm not sure if that'll help you, but here are some other things too. 1) They would be shy whenever you're around, especially when friend is there. 2) They would talk a lot about you with their sister/your friend and possibly wanted to hint their sister that they might be interested in getting to know you. 3) When they're with their friends, they refer to you in your name not 'My sister's friend'.
This could depend on the person speaking because to some people their younger sister will always be a baby or little, even if they are adult. However, you could also say that a baby sister is very young and unable to take care of herself, i.e. must be bottle or spoon fed. While a little sister may only be somewhat younger than the speaker, i.e. a year or more younger than the speaker. In any case, the two phrases do not refer to size. A four foot tall woman ten years older than the speaker would not be a little sister or baby sister. It must refer to age only.
This can be said in various ways. For females, if you were to refer to a sister who is older, you would say "mō taku tuakana". If you were referring to a younger sister, you would say "mō taku teina". For males, this changes completely. You would simply say "mō taku tuahine". Mō = for Taku = my Tuakana = elder Teina = younger Tuahine = sister
yes he has 2 elder sisters and one younger sister and three half-sisters refer the wikipedia for more information : http://en.wikipedia.org/wiki/Hassanal_Bolkiah
This could refer to an older gay man who is in a relationship with a younger gay man. It could also refer to a single mum who allows her gay best friend to act as the father of her child.
* There are two terms for 'sister.' One is an old slang term used up until the 1950's. Example: 'Listen sister, I had this taxi before you.' If a person has a friend of the opposite sex and they refer to them as 'sister' then yes, that means that person is endearing to them; thinks of them as a sister with no romance involved.