Why does my grown sister think she can bring her cats into the house and put them in any room of the house, when it is not her house and the house rule says no animals? How can someone think they can come into my room and put pictures of their family and their furniture, clothes and books into my room? When I stand my ground, they get all bent out of shape. They say they do not want to hear it and it upsets them very much that someone stands up to them. Then they cannot sleep or they get sick or something. They whine that there is no place to put their clothes, cats, pictures, etc. and complain if I cover the pictures with mine, or put mine in their place, in MY room!!! This is definitely a boundary issue in both of those cases. I am an adult and have an equal share of the house with them. They have their rooms in both cases, and I have mine, or I thought I did. When I stand up for my rights, other members of the houses say, "Please we want some peace around here." which the people with the boundary issues are happy to agree to so they can do whatever they want. The other aspect is that my sister will not let me use one of the house bathrooms because she says it is hers. I turned on the light in there once and she had a total fit. It is not hers, it is the guest bathroom. The other lady is like that too. They feel justified in walking all over you, but you better not tread one foot into what they think is their territory or it produces some type of emotional reaction--anger, tears, outrage, etc. Except for that, they are nice people--helpful, courteous, kind, and usually Christians. How can I help these people? Should I just let them have their way, or would it help them more if I stood up for my own boundaries and risked disturbing others? What is this syndrome called?