I'm not sure why you didn't give the man's name (Marco) and place of birth (Montenerodomo), but with this extra information I was able to get a hit ...
The following pdf article describes people who were shot by the Nazi’s in Montenerodomo, Province of Chieti.
4 of them were the wife and 3 children of Marco Di Luca. They were killed on 2 Feb 1944 as follows:
Anonietta D’Antonio b 9-3-1909 Torricella, peasant, parents: Nicola D’Antonio and Di Nanni Maria
Vincenzo di Luca b 28-04-1930 Montenerodomo, parents: Marco Di Luca and D’Antonio Antonietta
Consiglia di Luca b 6-4-1934 Montenerodomo, parents: Marco Di Luca and D’Antonio Antonietta
Doroteo Nicola di Luca b 9-2-1937 Montenerodomo, parents: Marco Di Luca and D’Antonio Antonietta
Source:
https://www.straginazifasciste.it/wp-content/uploads/schede/Montenerodomo_S.%20Martino_02_02_44.pdf (search for “Australia” for a description of the event)