No. Just say no. Unless the two new people are the parents. That might be fun. Or maybe even effective, if you can show them what to do. If you don't feel like your experience prepares you for that, you need to make the call to get out of this booking.
@JaneB, how many months old is this kid? I think you said you had the date of birth on the reservation. And what day is the lesson booked for?
@JaneB, how many months old is this kid? I think you said you had the date of birth on the reservation. And what day is the lesson booked for?