Assuming he is your only sibling with female children, you would have two (2) nieces.
they have 7 daughters
He has 5 children, all of the daughters have the same 1 brother.
5, because each daughter has the same brother
Frank Lampard has 2 Nieces and 1 Nephew, Millie, Mia and Stanley - Mia & Stanley are brother & Sister
If there are 6 daughters and each daughter has one brother, that means there are 6 brothers. 6 daughters and 6 brothers = 12 children by using addition.
You are not related to your niece's husband, although some would call him your nephew by marriage. But that is a relatively recent construction and not used by many. You could also call him your brother's (or sister's) son-in-law.
The Plum family consists of Mr. and Ms. Plum, their six daughters, and one son (the brother of the daughters), making a total of 10 people in the family.
Persephone, as daughter of Demeter and Zeus (both of them the brother and sister of Hades) most assuredly married his niece. For the sake of cutting this short, I'll only include divine (goddesses) nieces. From only Hestia did he receive no nephews or nieces. His siblings include: Zeus; the Fates (Klotho, Lakhesis, Atropos); the Seasons (Eunomia, Eirene, and Dike) the Muses (Kalliope, Kleio, Ourania, Thaleia, Melpomene, Polyhymnia, Erato, Euterpe, Terpsikhore); Artemis, Aphrodite, Melinoe, Ate, Eris, the Litai (Prayers), Alathea, Harmonia, Britomartis, Pandia, Hersa, Nemea, Agdistis-Kybele, among many other nymph daughters. Hera; Hebe, Eileithyia, the Charites Demeter; Persephone, Despoena and Chrysothemis Poseidon; Aithousa, Herophile, Ourea, Cymopoleia, Benthesicyme, Rhode, Charybdis, and Athena among many other nymph daughters.
Aunt Jane's Nieces Out West has 316 pages.
Aunt Jane's Nieces at Work has 298 pages.
Aunt Jane's Nieces on the Ranch has 276 pages.
Aunt Jane's Nieces on Vacation has 305 pages.