My brother arrived late this morning, tard or en retard?

Question

If the brother arrives late in the morning as apposed to being late is it still en retard or can it be tard?

Answer

Noticed Nimn's question afer posting but still am not sure why it cannot be Mon frère est arrivé tard (as opposed to en retard) ce matin.  He's not late for the appointment just late in the morning? Can tard not be seen as an adjective?

Answer

Bonjour Jennifer !Yes I agree that in the absence of context, both tard and en retard could work in this sentence.However, seen as we're testing specifically en retard here, I've therefore removed and updated this question to give it a clear context :)Thank you very much for pointing this out !Merci et à bientôt !