Hi Otto
It’s a way of almost hearing your son speak to you, to get as close as you can to hear his words and feel his mood through the last person who seen and spoke to him. It keeps him alive, it’s the only way left to try to hear his voice, his words, feel his mood feel his presence.
It’s not a logical thing. It’s an emotional thing.
You’re so desperate to hear them, be near them in any way you can. It’s as if by speaking to her, you’re getting a chance to re-connect with your son again and bring him near.
It’s not based on logic. It’s a primal instinct you feel when you deeply love someone and miss them so terribly it breaks you.
If I were her, I would speak to him and give him this. It’s the right thing to do even if not required by any law or written logical rule.
The father said he wanted to ask the witness what his son was wearing. If he had said what you mention, that would be an entirely different story. Instead, he wanted to ask a question that could be perceived as challenging the witness statement and credibility.