<human>: Could you distill the essence of the text into 1-3 sentences?

Ok here's the situation: 

My Step father and my kids have a tradition that when he is off on Thursday's he takes them out, often to a park or food place or anything else construed to be kid related, often errands are involved like running to this store or that. So today he only had my youngest daughter being my son was sick from the flu and my oldest had an after school program for studying for her state tests. One of my dad's stops were at sam's club to pick some stuff up, my daughter had a nose bleed and had to go to the bathroom so he took her to the family restroom. She often has nose bleeds I think because she picks it but she's the girly girl type and will never admit to it. When they came out of the rest room and older lady was waiting for them outside claiming she was with child services and that my five year old was too old to need somebody in the bathroom with her. The manager was called but not the cops and the lady followed my dad out to his vehicle to continue harassing him and to take down his plate number. 

The whole time there was no information exchanged and the lady never displayed a badge or id or anything but being the proactive person I am I have to know what the steps to protect ourselves would be aside from the obvious (make the home spotless and insanely safe)? My wife and I are maybe not mom and dad brady/cleaver/etc. but we're good proactive parents, when the school calls we're there, when the kids are sick they're at the doctor ASAP, we don't hit them anymore then a spanking when the situation dictates it, we try hard and push our kids hard in school. We're average parents but definitely not the slacks and polo shirt types. 

Thanks for any helpful advice you can give reddit.
<bot>: Nosy woman claimed to be child protective services because of my youngest needing the restroom and them using the family restroom. What can I do to protect my family from any bullcrap?