Dropping articles: "I have a little brother and little sister." - is this correct? [closed]

In comments FumbleFingers wrote:

Most native speakers would probably say I have a younger brother and sister. There are dozens of instances of a little brother and sister in Google Books, but only 2 instances of a little brother and a little sister and just one a little brother and little sister. Syntactically they're all fine, and in practice would always mean exactly the same.

I have a little brother and best friend sounds to me like a non-idiomatic "zeugma".