Why has brother never had the wrath of bpd mom?

[Guest guest]

I am still learning about bpd. My bp mom has always gone back and forth

between my sister and I as far as which one of us is evil and which one

is wonderful. She typically has never been able to maintain a

relationship with both of us at the same time for any length of time at

all. Usually her relationship with either one of us has centered on her

constant analyzing of the evil one at the time and usually you can't

get a word in edgewise. My brother is the youngest of three and I am

the oldest sister. He seems to NEVER be on the evil side even since he

was a child. Her focus has always been on me and my sister and he is

always little dougie. He is now married to a bpd woman who totally

demonized me and my brother just basically told me " dont call me, ill

call you " I don't have a relationship at all with him now and haven't

for about 3 years. My mother who was estranged from him after my

fathers death has now become his wifes best friend and I am of course

the sick one, the liar with anti-social personality! My brother is as

always free from her tirades, her hours long analyzing of everyone but

herself, and he seems to just not even notice that there is a problem!

Is it commom for bpd moms to idealize one child always and have

virtually no expectations of them but outlandish expectations of the

other kids?