Poisonous Family

I spent a few years living with my sister and her husband who over time went from being grateful for having me to disrespectful and taking advantage of my good intentions. I would often be targeted as lazy for not doing almost literally every chore in the house and was often criticized for any perceived failure.
To elaborate I did house and pet sitting while job searching but it was understood that this arrangement would last only until I landed a job. However once I did so, I found myself fighting over everything from the amount of rent I should be paying, to the chores I was responsible for (in short, feed your own damn dogs). My sister would pout about having to both work and care for her own dogs and my brother-in-law would yell at me that I needed to "do more" my sister even went so far as to tell both my brother and my mother that I was lazy and wasn't doing "anything." My parents who still have a mental image of me as a little girl ate it up. My brother didn't even consult me before taking my sister's word for it.
I spent hours job searching when I wasn't doing chores and burnt myself out more than once trying to appease their growing demands.
I felt trapped and alone, being at work became a joy as my coworkers and managers appreciated me as my own family didn't. I was at a breaking point when I finally took my leave and entered college, taking up residence in the dorms.
To make it worse, my sister would do illogical things like throw out the mop I was using to clean the floor and would insist I clean the tile floor of a rather large house by hand, she would also insist that I sweep vacuum and mop (remember without a mop) daily on top of washing dishes, throwing out trash and caring for and cleaning up after five dogs (some of whom were not properly house trained) and three cats. Both my sister and her husband would deliberately leave trash lying out because they were convinced I wasn't doing enough.
On the occasions where I attempted to explain that I was job searching online and not lazing around and kicking back I was simply not believed and the insistence that I spend eight hour days, mucking up after them and their pets increased. When I finally did get that job, they still seemed to expect me to do all of their housework as well as work and they seemed to think that they should have open access to my bank account, because expenses that I agreed to make up by doing the outlined house chores were still counted against me. On one occasion they forced me to clean and do chores while sick with a bad case of the flu. It was taken for granted that I was just being lazy and trying to avoid doing my share.
I am sharing this because I want other people who may be in a similar situation to know that they are not alone and that it is not OK for family to treat you this way. If you suspect your family is treating you in an unhealthy manner then you need to confront your feelings and find a way to resolve it, either by getting someone to intervene on your behalf, or by moving the hell away. Remember that it is not selfish to worry about yourself first and that if you easily fall into a pattern of helping others, you will be at risk for being taken advantage of....even by your own family.
Addendum: To this day my sister is under the impression that she had the right to be angry at me for "leaving" when it was her poisonous attitude that drove me away, yet she can not fathom that she has done anything wrong herself.

I can offer some insight into what it means to have poisonous or toxic family member(s) and how I am dealing with it, as well as what it is like to be someone who is other-oriented, meaning I often put the needs of others over my own needs which can make me and those like me vulnerable to self-oriented people.
I can also offer some helpful links that helped me to recover from the emotional manipulation after I moved out.