"Ο αδελφός μου είναι σε σύνδεση."

Translation: My brother is online.

[trezost]

if my brother is on a telephone connection he is not online, but simply on a (telephone) connection... I am afraid 99% of the Greeks would say "ο αδελφός μου είναι online" instead of the complete/correct Greek translation "ο αδελφός μου είναι συνδεδεμένος στο διαδίκτυο"

[jaye16]

And I'm afraid you are correct. Both for the Eng. "online" or just "συνδεδεμένο".