my mum make me feel angry....

my mum...haiz...she have a 'kai'son...but..she treat him better than us(me n my siblings)..y?as a example..tat day..she forgotten to bring her handphone to work..when she come back from work work..she straight away ask me did i see her msg...shit man...she so don't trust me..but when her 'kai' zai come to our hse..she juz let him play her phone,see her msg...@##$%@##$@$%$#.... another thing is...infront of the kai zai..she never get angry wan..but ...when he leave..walao a...like vocano...tats y btween me n my sister..she has a nickname called..."VOCANO'...hahaha...every week..my mum will make bread atleast 3 times..almost everytime she will bring some to him...haiz..i oso duno y she treat him so good..he make of gold ah...@#$%@#$%@$%#$.....