I have a Parenting Order and it says that my ex-spouse has parenting time this weekend. I don't think COVID-19 mandatory public health measures are being followed. Do I have to send the kids to m...

Yes. You must comply with the Parenting Order. You can apply to the Court to vary or change the Order, but the onus will be on you to show that the other parent has real plans or behaviors that are inconsistent with the current public health measures. Do not take advantage of the COVID-19 situation to deny parenting time. Self-help and the breach of a Court Order could find you in contempt of Court with fines or worse.