Bypass parental controls on the FRITZ.Box?

I have a problem, and my brother says that it is okay to deactivate Internet access from almost all of my devices in order to play his stupid online games free of lag by making a child lock and access all over the fritz.box completely prevented. Now nothing works on my TV, my laptop, my cell phone or my tablet (really all day, I don't even have online times) and it's screaming.

My parents don't do anything about it when I complain, and my brother doesn't care at all (how can you be so childish at 19) so I don't know what to do.

Can you somehow deactivate or bypass it without noticing anything?

No, you will probably have to clarify this with your parents.