As Torch Wielding Guy said, you should use "or" instead of "and" I don't like chicken, and I don't like ice cream= I don't like chicken OR ice cream. I like chicken, and I like ice cream, but I don't like them together on the same plate= I don't like chicken AND ice cream. This pattern in language reflects a pattern in logic called "De Morgan's Law" not (A and B) = not A or not B not (A or B) = not A and not B You can read about De Morgan's Laws in Chinese here: https://zh.wikipedia.org/wiki/%E5%BE%B7%E6%91%A9%E6%A0%B9%E5%AE%9A%E5%BE%8B

Almost. "I don’t have any brothers or sisters" sounds more natural.

More common would be "I'm an only child" Also possible, I don't have (any) siblings.

Thanks

We would usually say "I don't have brothers or sisters", so "or", not "and".