Extended family

Beyond parents, siblings, and children, the family extends to uncles, cousins, nephews/nieces, and in-laws. Here is the most common vocabulary.

Uncles and cousins

Euskera	English
osaba	uncle
izeba	aunt
lehengusu	male cousin
lehengusina	female cousin
iloba	nephew/niece (also “grandchild” in some dialects — the context decides)

In-laws

Euskera	English
aitaginarreba	father-in-law
amaginarreba	mother-in-law
koinatu	brother-in-law
koinata	sister-in-law
errain	daughter-in-law
suhi	son-in-law

Usage patterns

• Nire osaba Bilbon bizi da. — My uncle lives in Bilbao.
• Bere lehengusinak hamabi urte ditu. — His/Her female cousin is twelve years old.
• Zure koinata euskalduna da? — Is your sister-in-law Basque?

The words for in-laws are often formed by combining existing words (aita- + ginarreba). You don’t need to memorize the internal logic; they’ll stick with use.