Yes definitely the son (Frank jun) - he was aged 20 when he was MIA. He was in the Scots College cadets but then trained as a pilot and was the pilot of a crew that disappeared without trace.
His birthdate was 28 May 1921 in Sydney NSW and his NOK was Frank Richardson and he enlisted Sydney.
cheers,
Ros
(well worth reading the digitised records - have a box of tissues handy. The family including sister Treasure and father Frank wrote repeatedly (desperately!) to get more (ANY) information but there was nothing to be found)