Ah, a pair of boys is good...Sorry if I sounded irate about that.... ^_^

It is very possible that your brother is carusing his aggression. My girls are both very nasty if you put your hand near the bars of the cage while they are inside. Both were teased through the bars of the cage by an ex-coworker of mine before I brought them home. If I take them out they are playing and bruxing and perfect, but watch yourself while the cage is closed with them inside....