They are starting to really mirror the Duggar family who are the USA's largest family with 19 (live) children. They have become a "brand" and give lots of parenting advice/workshops, in spite of the fact that it is the older girls who raise the children, not the Mother!
Sadly Michelle Duggar had several late miscarriages and then baby #20 died in the womb at 18 weeks, which is similar to Sue. I think that is perhaps the bodies way of saying enough at that point.
I do think the Radfords are a close family, with Mum and Dad more like friends than parents (they were delighted that 17 year old Sophie was pregnant several months into a relationship) and in this episode I saw Chloe in a different light; it seems they rely on her a lot. Noel said that she usually cooked with him, and baths the younger children. Sophie did say that she moved university because if something went wrong at home it made sense that she was close by to help, not because she wanted to.
I would love to see where Sue admitted online that they get CTC. I don't personally care if they take the full whack benefits, but I do wish they would stop going on about "wanting to show people that they can raise a large family without any help"