Your sister's daughter is your niece and her granddaughter is your great niece.
If you find that your granddaughter has knots all over head you should call her parents. If you are her guardian, you should take her to see a doctor immediately.
To Write
granddaughter
The granddaughter should appreciate any amount the grandmother can afford. It is best not to over spend to impress the granddaughter and only give what you can afford. Anywhere from $50; $100 or more if you can financially afford it.
You would be 2nd cousins, assuming that the brother's wife's granddaughter is also the brother's granddaughter. If the granddaughter is not the granddaughter of the brother, there is no relationship.
Yes, "The Capital" should be capitalized because it is a proper noun and the word "capital" is an essential part of its title.
A proper noun should be written with the first letter capitalized, for example, "London" or "John Smith." This helps distinguish it from common nouns and gives it importance as a specific name.
Elvis does not have a granddaughter .
Your granddaughter is your sister's great niece. Your sister is your granddaughter's great aunt.
The word "granddaughter" is one word. Otherwise, it is praising a daughter.
No. Granddaughter is a noun. Except for the possessive form (granddaughter's) there is no adjective as there is for daughter (daughterly).