If the parents are choosing to rent in an extortionate area - when there are cheaper places for them to live in - whilst letting their children go hungry, then it is the parents who have made the choice to let their children go hungry.
This is incredibly naive.
Houses and jobs aren't things you can just wave a magic wand and they fall into your lap.
A rental period might be 12 or 18 months and there are often harsh financial penalties for breaking your tenancy agreement early. New tenancies require a substantial deposit and often require two months' rent upfront. And of course there are the costs of moving itself - movers are expensive, and long-distance train tickets can also be very costly. People who live paycheque to paycheque are often trapped in bad tenancies since they can't afford the huge upfront costs associated with moving. Not to mention most jobs require a notice period, you can't just walk out on your job! And if you're furloughed, why would you want to quit your job on the hopes of being able to find a new job in a different area?
Not to mention the blithe hand waving "oh just move!" ignores the fact that in order to move to a new area, one first has to land a new job in that area (during a pandemic where half the country has shut down and fewer places are hiring), find new schools for their children, find new healthcare services, find new childcare, etc. etc.
And why should people be forced to abandon their careers, their families, their roots, uproot their children away from their education and all their friends, because their job has temporarily been impacted by a global catastrophe outside of their control?
There are NMW jobs all over the country.
The comment you're replying to was making the point that a person on NMW is unlikely to be able to afford the thousands of pounds it costs to move cross-country.