My brother's help almost cost me a client yesterday

I want to share a close call I had with family helping out during a shoeing job. My brother offered to hold the horse steady while I worked on the hooves. He got distracted by a text and let the lead rope go slack. The horse shifted suddenly and I almost burned myself with the shoe. The client was watching and looked really worried about the safety lapse. Now I think twice before letting relatives assist unless they are fully focused. How do you handle family wanting to be involved in your work?