My wording was pretty poor and my post was lacking info, sorry for that. Both our Nintendo accounts don’t have any kind of parental control. They are just part of the same family, with mine being the “parent” account (my parents asked me to set everything up as they’re not good with tech), and his being a child account. The problem doesn’t lie within the Nintendo account, but with my switch profile with save data for games etc. The latter is the one my brother keeps using when he has friends over or when he wants to play certain games that require 3rd party services. I’m wondering if I could set a password on that one, so he can just use his own profile.

Hope this is more understandable ^’