It would be best to apply for his/her own certificate of citizenship cause when they applied for a specific jobs, they are required to produce a copy of Naturalization. Both of my boys are derevatives of mine (K1) they
were 16 & 14 Yrs old At that time, (4yrs
ago). My eldest (16) appeared
at USCiS For oath taking ceremony, probably 15 below is not required,
as to my youngest (14), certificate was sent to our home address and not required to appear. In gods grace, both applied to be a
servicemen, eldest is now Army and my youngest will start Navy training after high school graduation( 2021) they are Asked
to submit a copy of proof of their certificate citizenship. Who knows what requirements will be asked later? But be ready.