He's probably just as worried as you are. Ease up a bit on him, bettas are hardy, unless your brother really messes up, they'll be fine. Check on your little bro once a day, and hear out what he's done. Chances are he's doing the best he can. If need be, it might actually be less stressful on both of you if you tell him only to check up on your betta fish say at the most 4 times a day for say no more than 20 minutes at a time. Twice to feed him (morning and evening), and the other two times to do the water change or just to look.
When I had to leave my eleven year old sis in charge for a week, I left a list of specific details that went indepth, and about three days before I left I forced her to be my shadow so she see's how to do things. That way, she had seen what she needed to do, and she had a list letting her know she was doing it the just way she needed to. :) Things went smoothly and everyone was fine when I got back.
Last edited by JKfish; 01-03-2011 at 02:14 PM.