I am very close with my sister and always have been. She doesn't have many friends (none that are really close), isn't married, and has a teenage son who is often working or with friends. She depends on me and my partner of 14 years for company and entertainment. She and my partner clash is some ways and neither of them seem to really enjoy sharing me with the other. They're a lot alike in that they're both classic firstborn adult children, outspoken, controlling, etc. My sister has been trying to get us to commit to going on a vacation with her. We travel every year and we consider it our time together to escape and reconnect. We probably can't afford more than one vacation this year and, even if we could, my partner is not interested in going on vacation with my sister. I just don't know what to say or how to handle my sister telling me that she doesn't have any friends to go with and she just wants to go somewhere and have fun. I don't want to hurt her feelings but I also know the relationship with my partner has to come first. I'm stuck. Thank you!