I Have Toxic Family Members

My aunt came to visit in my country. Shes staying by my grandma which is an hr away from my town. My siblings all live in their own houses. I live w our mom. On previous occasions my siblings went to my grandma's wo telling. Yesterday my brother did so wo telling me....when I asked him why he said he was calling me and didn't gt. I told my sister that they did that and I told her to let me know when she's going to visit so I can go w her. Today I called my grandmas house and they told me that everyone including my sis are there. I asked my sis abt this and said they left at the last minute...that it wasn't planned. I don't even know why they do stuff like that. I'm considering just forgetting abt them but then I need family