Usege of subject: Rani and leo have a red book. vs Rani and leo have red books.

[Kiki]

if we use subject they and we

example : they have a book

or

they have three books

it could be if we say

Rani and leo have a red book

or because the subject are two so we have to write

Rani and leo have red books

Sir, it must be the object in plural too

i'm confuse

[Mister Micawber]

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It depends on how many books there are. If they share a single book: 'Rani and Leo have a red book'. If they each have one, so that there are 2 books: 'Rani and Leo have red books'.
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Native English teacher at Mister Micawber's