When talking about your brother and sister to somebody else, you would typically use the pronouns "they" or "them." For example, you might say, "They are coming over later" or "I spoke to them yesterday." If you want to refer to them both together, "they" is the appropriate choice.
you can't put a pronoun after "sister
Sister is uso if a female is talking about her sister; tuafafine if a male is talking about his sister. Brother is uso if a male is talking about his brother; tuagane if a sister is talking about her brother. Cousin is Tausoga, so if it is a male cousin, it's tausoga-tama, and if it is a lady cousin, it's tausoga-teine.
If you have a brother and a sister and don't know what you call them when you are talking about both of them, then the answer is sibblings.
She is a singular pronoun. Put it in a sentence and you will see: "She is my sister." This sentence is talking about one person, not more than one person.
the answer isa boy is their nephewwhile a girl is their niece
In the English language it does not matter whether it is your elder brother or your younger brother. It does not matter if you are talking about the child of a brother or a sister. The daughter of any brother or sister is your niece. The son of any brother or sister is your nephew.
Oneesan is older sister. Imoutosan is younger sister. Older sister is onee-chan and younger sister is imouto. Also, older brother is onii-chan and younger brother is otouto. Older sister - (when you're talking to her or talking about someone else's sister) is Onee-san. If you're talking about them to someone else, then it's ane. Younger sister - Imouto
I imagine you are talking about your spouse's sibling's spouse (your wife's sister's husband). No.
If a female is talking, it's "uso"; if a brother is talking, it's "tuafafine".
Your younger brother's wife is your sister-in-law. Your older brother's wife is also your sister-in-law. In English, we make no distinction between the two. However, when talking to your sister-in-law you do not address her as sister-in-law. You just call her by her name.
There is no relationship, they share no common ancestor.
He- boy, brother, man, Bob She- girl, sister, woman, SueThey- boys, girls, children, parents