The man probably trusted his family, which is a really natural thing to do, though sometimes it turns out to be a mistake, like it clearly did in this here, as the son proved untrustworthy, unfortunately.
What relationship is stronger than father and son! Of course, he trusted his son enough to inform him about his mobile wallet and the content stored inside, otherwise, he would not have a clue about it.
It is a shame something like this happened with a trusted member of the family, is this indirectly saying don't trust even your closest relatives! I think the son is just being too impatient to do stuff like this, if this was a random thief it would have been different, but this is a son, too bad this can cause a rift in the relationship between father and son.
Maybe it would be understandable if the theft was committed by someone else and there might be a legal process running in the case, but this case is quite difficult because the victim is his own father, no matter how bad the father is of course he will not report his son to the police, but of course after this incident the relationship between the two people will become tenuous in my opinion and there is no longer any trust in one another in the family.