The two Greek airlines Aegean and Sky Express are currently offering flash sales on their flights.
Sky Express has a 1+1 flash sale (buy two seats, pay for one) valid until February 13th midnight (Greek time).
In April I saw some Heraklion - Athens tickets €25, and Athens-Naxos tickets €51, provided you booked two tickets.
https://www.skyexpress.gr/en/flights-with-one-plus-one-ticket-feb26
Aegean is offering family fares with discounts of up to 100% for infants and children up to 11 years old. Book before February 19th at midnight (Greek time).
https://en.aegeanair.com/flight-deals/offers-competitions/family-deal/
Before getting too excited, please read the terms and conditions and any limitations of these sales.