I'm trying to understand why my Chinese sister in law is so territorial over my mother. Her and my brother have been married 10 years, they have 2 children together. She is a teacher and my brothers job requires him to be away on business quite a bit of the time. My brother and his wife purchased a home, however, her parents virtually live there (they have a home of their own but its easier to help with childcare etc if they live with my brother and his wife). Recently her sisters family also moved in. My brother would like to find a job that would be more local, however he literally cannot stand that her whole family lives with him and according to her they can never ask them to leave. Anyhow, back 12 or so years ago when she was just being introduced to my family, she made a beeline to my mother and has not let up since. She made a note of what books, face creams, restaurants my mother likes and brings them to her, talks with her about them etc. She takes my mother out to dinner and just came in really really hot. At the time, I thought well this is nice, its a bit much but its nice, i stood aside and thought, i'll let them bond. 12 years later and now the sister in law lives at the summer house my parents own for the entire summer with the children. This is a 'family' property and all us kids are encouraged and allowed to vacation there at will. My parents live there all summer. But so does my sister in law. In fact, due to covid i was not able to go for a year. I showed up this year and my sister in law was acting like i was a guest there. At first i thought she was just being hospitable, however, i then saw it as territorial. She kept referring to 'inside jokes' with my mom, name dropped each and every extended family member with an anectode about a RECENT visit. I thought, this is weird, she knows i havnt seen family in a year and i'm sad about that? She seemed to want me to know, that she was COMPLETELY INVOLVED with my entire family. Ok. So i'm trying to have some 1:1 time with my mom who is 75. Impossible. My sister in law inserted herself into every conversation, every act, everything. It was very awkward and my politeness wore off on day 4-5. I then was very forward and requested that she not help me with dinner (this is her DOMAIN, the kitchen), that I would be taking my mom to lunch, just her and I. Well, my sister in law left the property with the kids for a couple days. It was like, if it wasnt her way, she didnt want to be involved. Anyhow, she stares at my mom and hangs on every word. My brother is the only son in our family which in western culture means jack squat. lol. Him, myself and our sister are equals in our family, in terms of importance, future inheritance and obligation to our parents. But she is constantly dropping Chinese culture bombs on us like 'in Chinese culture the oldest son inherits everything'. And, we are going to move closer to your parents so they can live with us and we can take care of them. I truly feel run over by her and just trying to 'hold space' and have access to my mother took all my energy and my visit was exhausting. We know have Christmas coming up and the entire family is getting together. My sister in law has already made some suggestions about how things will go, meal planning etc. and I cant help but think - please back off. She has both her parents, her sister and all her relatives. Can't she let me have mine?