English is 'descended' from Anglo-Saxon and Old French, with several influences from other languages, too. All known languages are 'descended' from other languages, so there is nothing odd about that.
that it is only in English
Yes, English language come from an Albanian language.
british language is the purest english language
English is a Germanic language.
english language arts
You brother's daughter is your niece, just as your sister's daughter is your niece. The English language does not have different terms for daughter of brother and sister.
Because they are both female, and that is the way the English language does it.
The English language has no word for your brother's daughter other than "niece."
The English language does not have a special term for an adult son or daughter. The words son and daughter apply without regard to age.
Your uncle's daughter is your first cousin. The English language does not have a special term for the spouse of a cousin. That spouse is not considered to be related to you.
The English language has no special term for the brother of the woman who married your son.
You daughter's husband's mother is your daughter's mother-in-law. The English language has no term for a relationship between you and your daughter's mother-in-law.
The English language has no term to describe a relationship between you and the parents of your daughter-in-law. In English-speaking cultures, you are not related. If you have to refer to them other than by name, you can call them "my son's parent's-in-law" or "my daughter-in-law's parents."
No they shouldn't
Shakespeare's language was English and "have" in English is "have". "I have of late, but wherefore I know not . . ." (Hamlet) "I have another daughter" (King Lear) "We have heard the chimes at midnight" (2 Henry IV)
In the English language culture it does not matter whether your sister is younger or older than you, her daughter is your niece. You are her aunt (if you are a woman) or her uncle (if you are a man).
The English language has no special term to describe the grandfather of your son-in-law, and he is not considered to be related to you.