Can't update apps due to wrong icloud password

So I have been trying to update my apps all night and it keeps showing me the screen pictured below, and when I enter my password it prompts me to continue to settings to sign into my brother's icloud account. It is worth noting that my brother's icloud account is the Family Admin for family sharing, however my app store is logged into my icloud account. I don't know if this information also matters but I have parent/guardian status in the family sharing. I would like to be able to update my apps without needing a code from my brother every time, as we are both adults who have busy lives. Please help.