https://www.familysearch.org/ark:/61903/3:1:3QS7-L99C-WKJK?i=99&wc=M6TQ-KM3%3A342082201&cc=2023926 - full record from the Antwerp Police Immigration records
Scrolling through the many images, there's a lot of information someone who knows more Dutch than me will need to translate.
Image 119 on that link is particularly interesting - seems to be a letter from a lawyer (in French) on his behalf. It mentions that his parents are in Sora and are property owners there; that he has an Italian passport and an identity card issued in London, that he has six children (two girls, four boys) and his wife (Josephine Korn) is of Belgian nationality, being born in Antwerp
Image 123 (dated 1929) gives birthdates for all the family, he was born 6 April 1893 and his wife 7 October 1893
It also gives details of his parents - his father Fillipo was aged 68, born Sora, living Campana? His mother Rosa Stafferi also born Sora, aged 67, living "with her husband".
Image 128 has photos of Domenico and Josephine
There's probably more info in there I've missed!