The article isn't expressing concern for the women, is it? It's just pointing out that there's no systematic checks on their kids. Given a mother who goes to prison is possibly not going to, you know, have her life together magnificently well, it seems reasonable to think that social services should automatically check to make sure that arangements are in place and are adequate. It's not the kid's fault, after all.
And it isn't good enough if a kid is just left without any care provision at all because their parents are shite. It's also a worry if the grandparents are, as it says here, often so useless that's a large part of the reason the mum is a mess - cycles of deprivation, and all that.
I dunno. Seems reasonable to think that if a family are seriously and dangerously crap, the state needs to step in, and if a mother goes to prison that should raise alarm bells about potential problems in the family. The kids haven't done anything wrong.
The grandparents you quote wanted their grandchild, they just say they couldn't afford to care for them without that money. I can believe that. Pensions aren't huge. It's a fact that it would cost the state a hell of a lot more to keep a kid in care than with family and the go didn't choose the situation. They are stepping up and taking the kid - fifty quid a week is not exactly coining it.