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I don't really get this question, tbh. Why and how would you ever 'choose' the number of siblings like that? I have 3 younger siblings, and despite of all of the fighting and all the hurting at times, I would never choose to remove/change any of them; and I definitely wouln't just 'add' a new sibling for my own benefit. I love my siblings for who they are, because they are my siblings, not because of how many they are, or what gender they are. Idk, it just feels weird to me that anyone would think of their siblings in numbers/genders like that.  But that's probably because I have siblings, so the thought of being able to choose like that is way too foreign to me. I get wanting siblings, though, but to think about 'how many' just weirds me out. I'd always wanted an older sibling, but I would never actually choose to get one, or to change things, even if I could.

or maybe I'm just reading too much into this question, lol.