Free admission for under 5's with paying adult

I'm wondering if other venues do the same as us - we offer free admission to the museum for under 5's, with a paying adult. At the moment we don't really have a way to control this online - theoretically, someone could add 5 "under 5" tickets to their basket and pay nothing. We would spot this on scan/entry, so it's not a huge issue, but I'm curious if anyone has a better solution. Pricing rules become tricky as we use our adult ticket price types in another pricing rule. 

Any suggestions or thoughts welcomed!

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