Familiar means Relatives

Question

I cannot understand the exact meaning, can somebody make a simple sentence in English ? I received it from "word of the day".

No era un familiar, pero lo llaman "Tío Gary." - He was no relation, but they called him "Uncle Gary."

Answer 1

No era un familiar, pero lo llaman "Tío Gary."

He wasn't a relative, but they call him 'Uncle Gary.'

They aren't my real relatives, but they are like my grandparents.

No son mis familiares en verdad, pero son como mis abuelos.

Answer 2

Gracias !