Basicly it is your cousins husband or it could be your nephew-in-law
She is your niece.
Son-in-law.
The sons and daughters of Gaia and Ouranos, namely her brother-husband Okeanos, as well as Hyperion, Krios, Koios and Iapetos and her sisters Rhea, Themis, Phoibe, Theia and Mnemosyne.
Your daughters husband is you son-in-law.
What family members your is fathers mothers daughters sons sisters
Medusa and her two sisters were daughters of Phorcys and Ceto.
She is your niece.
All of the daughters of Zeus are half sisters of Athena.
Husband in-law 2nd Answer: Actually, it's 'Brother-in-law'.
sisters in law
Grand-Nephew
The sisters are not named per se. Scripture only says Adam and Eve had sons and daughters, not stating the daughters by name.