Shouldn't haber be conjugated in the ellos form, so it would be 'habían', since there are two seats? Am i wrong?

Shouldn’t it have been conjugated in the form they, then it would be ‘had’, since there are two seats? I’m wrong? From Marcus Santamar...

Shouldn’t it have been conjugated in the form they, then it would be ‘had’, since there are two seats? I’m wrong?

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