«يَا بُنَيَّ»
My dear son!
The form of address need not prove a literal father–son relationship. Arabic bunayya can be an affectionate or admonitory vocative. By addressing the other man directly, the speaker makes his response personal and pointed.
His position then diverges from the first speech: relationships matter, but trust cannot always be granted indiscriminately. The passage combines a familiar tone with a firm argument.