Seniority matters.......

So I find that my dearest 1st born child who's just 5 years old has suddenly started to send his brother on errands *covers face*. The 'poor submissive' younger brother is only three and doesn't seem to mind running these errands. The errands include getting him water, fetching toys, etc and he says please (sometimes). Now I'm wondering do I wade into this matter or just leave them both? After all I send my younger siblings around even till now LOL. I wont want to undermine my no 1's authority as senior is the reason why I haven't exactly told him to please stop harassing my baby.... Advice needed abeg LOL I'm on a 9 day detox diet... it's only half of day one and im already feeling you know....... hungry. I just must keep up with this weight loss abeg, this constant spilling out of clothes don do.... I had my nails done over the weekend, painted them electric blue ;)yours truly is on fire, next week na green I go paint :D random thoughts as usual. make I go work small brb