Simple:
* My nieces are coming to visit next week.
* The family gathered, including aunts, uncles, and nieces.
* She has three nieces and two nephews.
Descriptive:
* My nieces, aged 10 and 12, are both talented artists.
* He spoiled his nieces with gifts and attention.
* The nieces were excited to play with their new toys.
In a phrase:
* I love spending time with my nieces and nephews.
* The wedding was attended by all his nieces and nephews.
* She sent birthday cards to all her nieces and nephews.
Remember:
* "Nieces" is the plural form of "niece".
* It refers to the daughters of your brother or sister.
Bonus:
* "Nieces" can also be used to refer to the daughters of your spouse's brother or sister, but this is less common.
I hope these examples help! Let me know if you have any other questions.