Learn Spanish (Latin America): El chico terco persiste, aunque no tiene razón. - The stubborn boy persists, even though he is not right.

Because the speaker is stating a known, established fact: they know for sure the boy is wrong. When aunque introduces a reality that the speaker is declaring as a fact, you use the indicative. If it were a hypothetical situation ('even if he isn't right'), you would use the subjunctive: aunque no tenga razón.

Why is 'he is not right' translated using the verb tener in no tiene razón?

In Spanish, a person isn't 'right' or 'wrong' using the verb to be (ser or estar). Instead, you use the expression tener razón (literally 'to have reason'). Therefore, no tiene razón is the standard way to say 'he is not right'.

Could aunque be translated as 'even if' in this sentence?

Not in this exact sentence, because it uses the indicative verb tiene. When aunque is followed by the indicative, it means 'although' or 'even though' because it states a real fact. To say 'even if he isn't right', you would have to change the verb to the subjunctive: aunque no tenga razón.

I know adjectives usually go after the noun, but could we put terco before chico here?