People kill me

The other day I'm at work and my next appointment comes in. She brings with her, her 3 little kids, 6, 3, and 10 months. This lady wants her nails filled and she wants me to put a full set on her 6 year old. (whatever lady) Anyway so I put the little girls nails on, then I paint the 3 year olds nails, then I start the mothers nails. During this time the 3 yr. old is getting restless which really who wouldn't after trying to be good for 2 hours, and she starts to run around and grab everything insight, which included my product. Now I didn't care that she was grabbing certain stuff of mine until she went after my UV light. That was a no go. So I kind of got after her (only because her mother really wasn't) so she settled down for about ten seconds. (not an exaggeration) What I don't understand about all of this is that as soon as you walk into the salon there is this sign that says "turn cell phones off and bring only kids with an appt" (not the exact words of course but close) so why is it so hard to leave your kids at home? Now I know that there are exceptions, which in those cases I understand. But really, do you really expect your little kids to sit patiently while you go to a salon? I don't have kids and I already don't expect them to. Like I said, some people just kill me.