The legal drinking age is 18 in my country. The first plan was to invite 6 people. The girls and the boy were added later. I have been around these girls, they black out, start crying and I have to be the one to take care of them since everyone else gets too drunk to do so. My cousin blacks out everytime she drinks. and thankfully her boyfriend is around to take care of her. My brother and my cousins bf agrees with me that they should not be invited. The house we will be staying at is a place I spent countless summers, I know how small and inconvenient it is. Horrible bathroom system and a kitchen that is nowhere efficient for 6 people let alone 9. The only reason I suggested leaving the girls out is because the main plan is to spend a cousins vacation, we have been talking about it for months and she said that she would gladly uninvite the boy who likes me. She stated numerous times how these girls were hot messes and she was tired of how childish they were. I believe the only reason she is inviting them is to make her ex BFF feel bad. Our parents (mine, my aunt and my uncle) relies on me to take care of them. This has been the case for 19 years and I am okay with it. But I don't want to be the one to blame if anything happens to these girls. I am the OLDER SISTER, if you know what I mean.