Best off asking on the WKW Facebook group for up to date info, if you’re on there.
I live nearish but haven’t ridden that section for ages*. Most of the trails locally had dried up really nicely up to last weekend. It’s mostly on firm terrain so after a bit of rain, it generally fine. There’s a section of narrow trail with the odd bit of small wheel sized drops near Men an Tol from memory.
Depends on kids’ ages, size, skills etc really…the whole route is generally not gnarly but there’s the odd section that’s rough and may be a little challenging for kids.
*I say ages…might have been 12 months ago when I had a bit of a re-explore!