Sibling alienation, sister controlling mother, brainwashing her mind and isolating mother from all the people who love her. My sister is evil.

my sister is a full blown narcissist .
since the last 17 years she has managed to manipulate our family and created a didvide and conquer plan .
she is a pathalogical liar and is extreamly cunning .
she sent my elderly father to india when he did not want to go and a year later when he became ill she claimed she would bring him back .
instead she kept him there with my mother as she already controls my mother and claimed he was too ill to travel . she kept him there for over 8 months and on the first day i finally got to see my father she immeadiatley said she was going to put him in a home .
i objected and said i would look after him and she succumbed to my demands .
it was only whilst i was caring for him my father whispered that they ( mother and daughter did not really come to look after him but to make him sign papers and drain his money and transfer his money on false pretences into my mothers account and then she my sister opened up accounts in india and then told my mother to transfer that money into her account .It was only later whilst I was caring for my father in the coming months my father indicated to me to what extent of cunningness , deceit & control my sister was up to & the no good she did with him in India . She thus preyed on him using my mother as her enabler and manipulated the situation to take control over all his assets and finances via my mother . That was why she wanted to put him in a home the first day he arrived from India , so she would not get caught out on her plan .
I was horrified to hear what my sister was up to and had to tread carefully as I did not want her to know what my father had told me
I looked after my father since he arrived in Autumn 2016 with occasional carers and Later in September 2017 I had to go to Hong Kong , my father was quite unwell and could barely speak .he did not want me to go but I said I would be back in approx ten days . It was when I was back I was in shock as my father an elderly OAP who was bed bound due to Motor neurons Disease & being paralysed somehow had a Black eye . When I enquired as to how that happened my deceitful sister tried to fool me said mum had accidently dropped his plastic food bowl on his eye whilst feeding him . I thought she must think im stupid you don’t get a black eye like that without a target punch to the eye so I enquired with my father whilst alone and he signalled to me with his eyelids that my sister had hit him and she was responsible for that as He unable to really speak . I then enquired with my mother who said she could not remember anything but not to say anything as she was already fearful from our controlling sister . When I did confront my sister she said “no I didn’t , you weren’t here .. oh OK then prove it” when I said my father had signalled to me she was responsible she replied he cant talk and his delirious . I then decided to keep a very close eye on my father and especially my sisters antics . I did not report it to authorities as my concern was for my fathers welfare and I did not want to create a scene ( as from a cultured Asian background it would be considered shameful what my sister did but I mentioned it to my elder brother who agreed that our sister was the only suspect that may be responsible .
now my father has passed away and she is totally controlling my mother who has dementia and she is alienating my mother from me , my brother , my mothers relations and grandchildren .
she has blocked everyone from my mothers mobile , changed the locks and does not answer the door .
i also know she has taken over our family heirlooms which go into seven figures and has made false allegations against me .
when i defended them she tried to use my mother as her enabler and relayed a message to my older brother stating if he turns up to court and tells the truth he will be disinherited .
luckily my brother said he would go to court and tell the truth and a day before the case she withdrew her false allegations .help me