Thanks for sharing this personal story. I hope it's helping you by getting it out.
Family are meant to be the foundation that helps to support people through life and to be a great example but sadly this isn't true for a lot of people. There will be family members who are toxic, those who neglect, those who lie. I just hope you get healing from this so the experiences don't continue to prevent commitments with other relationships any further when the time is right.
Here's an article I wrote on family & relationships; 'Loving A Family Member From A Distance' please check it out:
https://link.medium.com/keYOMgmBAeb
Looking forward to the next part!