In reply to stayfreejc:
Not in the Peak, but a good summer sport location with kids is
Rhossili Beach the Mermaid Wall sector offers a number of good routes in amenable grades. Idyllic location and climbs start straight off the golden sand, great for a beach/climbing day. The easy climbs are tidal though, so best to look at tide tables before you visit, spring lows give around a 5 hour climbing window, if the low is above 2m the climbs can't be accessed with dry feet. If you are in the area and keen to continue climbing once the tide is in (rather than chilling on the beach, building sandcastles, swimming) then on the non tidal outcrops above the beach are more Sports lines,
No match for crag id:729 the stuff on Wedge Wall is relatively kid friendly - short, unintimidating, good flat base, but the climbs are a little trickier than the easier options on the beach.
Perhaps one for a family holiday?