Hi all,
name changed as my_sis has "found" me on mumsnet.
Prety easy to work out though 
Back story
Dh sever amnesia, mood swings, lack of empathy 2 years+
He never and I mean NEVER initiates talks about his illness, treatment, therapy etc with anyone, not me, not friends, not members of my family appart from , strangely enough, my_sis.
My dh has, under the "guidance" of mysis _
going to several medical appointments
given my_sis, K, access to his medical notes
attended a mediation meeting with my_sis to help me and DH "as a couple"
organised a second opinion for DH
At Dh's request their conversations are "private and confidential" and he didnt want me to know about all the appointments etc.
Left my young ds ( 7 and 9) unsupervised in mysis car / playing in a car park for an hour whilst she and dh went to an appointment and then mysis lied about how long the ds were alone.
Put dh on a train , on his own , in the middle of the night to go up to stay with my evil sil. He had no idea where to get off or why he was on the train.
Arranged for DH to have his own car. whilst using this car he got lost on the M-way for 9 hours and had to be brought home by the police.
I found out about all this by chance, by luck,by trawling through my DH's phone, i was NEVER told directly my my_sis
Dh has been at hissis for the last 7 weeks._
I have no direct means of contact, I can only leave messages on dh_sis voice mail.
Dh's mobile number has been changed.
I have called day after day after day and get no response.
Dh has not spoken to the dcs in 3 weeks.
Mysis is in contant contact with dhsis and dh.
no one in Dh's family will speak to me.
All his benefits have been tranferred from the family a/c.
He has frozen our all our bank a/c.
my AIBU is
My_sis does not feel that she has done anythign wrong AT ALL and actually thinks that she is "only trying to help".
I am made to feel as though I am the one in the wrong, I am the "evil" one.
Sooooooo, oh wise and wonderful ladies, play devils advocat, show me her side, make me realise that I AM being unreasonable