@LessonsinChemistryandLove the identity of the narrator's dad matters for several reasons.
Firstly, out of all the children in Gaza whose stories could be told, the production company chose to use, as the narrator, the son of a government minister. This wasn't someone who would have 'had to toe the line' in the same way as someone paid by the state but working in street maintenance or in a low level clerical job filing paperwork. This was a decision-maker in government. What does that mean for the intent of the production company? What does that mean for the level of control the boy's parents had over what was filmed and said? Why did they pick him? Now, he may be an intelligent young boy who's good in front of a camera, and we shouldn't engage in adultification of him or hold him accountable for any of this - he's a child, and one who is vulnerable in a number of ways (including a risk of lifelong radicalisation) - but if a documentary is meant to represent the children of Gaza, surely anyone with any understanding of what has happened in this conflict should have appreciated that using a first-degree relative of a minister in Hamas's government would discredit the whole thing. So, why did they do it? It impacts upon the credibility of the documentary, the production company (and their previous work) and the BBC.
Secondly, money exchanged hands. Licence fee payers' money went to the BBC, then to the production company, and then into a bank account belonging to the immediate family of a Hamas government minister. Hamas is a proscribed terrorist organisation in UK law. It's illegal to fund or support them. Just as I hate the thought of money I pay in taxes contributing to arms involved in killing innocent people (in Palestine and elsewhere), I would hate the thought of my money, paid in good faith to the BBC, contributing to the personal assets of a minister in Hamas's government (fortunately for me, I don't pay for a TV licence, but other people do and their money should not have been used in this way).