but then there is a problem to thisIf your mom and dad are teachers at school and you're in the same class, would you call out your dad by saying "dad" if you want to ask a question during lecture? Or are you supposed to be formal like every other student?
That special relation can come into action at home. But while you're at school, you're supposed to have the same status and treatment as every other student.
Naruto barely comes home..... even when something important is happening he sends a clone
Bolt barely seeing his Dad wants to at least for once have a family talk but nope Bolt shouldn't be greedy and should address Naruto as Lord Seventh
it isn't like the rest of the kids actually have parents that they can go to and call Mom and Dad