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.
Husband in-law 2nd Answer: Actually, it's 'Brother-in-law'.
All of the daughters of Zeus are half sisters of Athena.
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.