Renewing citizenship card for my son

[Gokunama]

I'm renewing my son's citizenship card. His current citizenship card features a pic of him eight years ago, when he was one years old. He was born in Japan to a Canadian parent. On the form, it asks "Are you claiming citizenship by birth to a Canadian parent?" I'm not sure what to put there, cause he I'd say he's already claimed Canadian citizenship. Should I check the "yes" or "no" box for that question?