She has no relationship with you. You do not share a common ancestor. You technically are not even related to your niece's husband.
Second Cousin
Great-niece.
The children of your husband's siblings are your nieces or nephews. Their children are your great-nieces or great-nephews.
Nephews and nieces
your 2nd niece...!
Your husband's sister's kids are referred to as your nieces and nephews by marriage. More specifically, you can call them your "nieces" if they are girls and "nephews" if they are boys.
Your borther-in-law's children are your nieces and nephews. You are their uncle or aunt, as is your spouse.
If you wanted to say "nieces" as a plural, such as "I have two nieces", then it wouldn't need an apostrophe. If you wanted to say something like "My niece's teddybear", showing singular possession, then you would need an apostrophe. The word nieces is a plural noun. If you want to use it as a plural possessive noun then put an apostrophe at the end - nieces' My nieces' husbands are both doctors.
she never retierd but her daughters and nieces help her in her upholstery shop when her husbands died
They would be great nieces or great nephews.
They are your great nephews and/or great nieces. Alternately, some people say grand-nephews, grand-nieces.
It says what relation are your brothers nieces to you.... It could be your child or your niece also causes you can have two brothers and it may be the other ones kids. Or of course it could be your brother's new wife kid by another man making her no relation.