Japanese phrase
家族の国籍は___です。 ka zoku no koku seki wa ___ de su
Meaning
My family members are citizens of ___.
When to use it
States the nationality of a person's family. It sounds factual and somewhat formal, so it is more common in official or serious discussions than in casual conversation.
Example dialogue
ご家族も日本国籍なんですか？ go ka zoku mo nihon koku seki na n de su ka
Does your family also have Japanese citizenship?
家族の国籍は日本です。 ka zoku no koku seki wa nihon de su
My family members are Japanese nationals.