My dear Maria, After asking such questions, other questions come to your mind : - Do you have any siblings? -How old are they? -Are you oldest, middle or youngest? - Are your siblings mean to you ?‎ Anyway, remember you need to use plural nouns after ANY as below: - Do you have any friends that are like siblings to you? - Does he have any new ideas? - Do you have any new clients? All nouns in the above sentences after any needs to be plural. :) But after any you may have non-count nouns which has no "-s". - Do you have some money to lend me? - Does he want some more coffee? so no singular after ANY when you have count nouns; not for siblings nor for brothers and sisters. ;)