Your children are the cousins of your niece. Your niece's children would be second cousins to your children, and vice versa.
Cousins
They are 2nd cousins.
niece's - something that belongs to a niece. nieces' - something that belongs to multiple neices. nieces - plural form of neice. person who asked this question - an incredibly dumb person.
The word nieces' is the plural possessive form of the word niece (a female child of your brother or sister). Example sentence: Both of my nieces' birthdays are in May.
They are not related.
They are your nieces and nephews.
Your daughter and your niece's child are 1st cousins once removed.
Some nieces of sisters are related to each other and some are not. Your niece is the daughter of your brother or sister (your siblings). If you have more than two siblings and at least two of them have daughters, those daughters are your nieces and they are first cousins to each other. You can also have a niece who is the daughter of a sibling of your spouse. If two sisters have nieces who are daughters of their spouse's siblings, those nieces are not related to each other (unless the spouses are related to each other, as when two brothers marry two sisters)
If your great uncle married into your family some of his nieces and nephews are your aunts or uncles (or your parent) and some are not related to you at all.
Yes. your sibling's sibling's child. Yes. 2 siblings. Basically your niece's first cousin is ur niece/nephew as well
Your brother's children would be your nieces and nephews. Your nephew's children would be great-nieces and great-nephews.
Second cousins.