To be honest, if there wasn't a 'good' excuse for him not getting the lawn cut, I'm really more interested in why it didn't get done. It's not like me to just randomly toss out a threat, so I'm assuming he'd already not been doing it, and that he must have ignored whomever was left in charge when they tried to get him to do it. What I really want to know is why all that ignoring occurred, and why I didn't follow up more before leaving on the trip.
However, a promise is a promise. While I'm sure Ty would forgive me for breaking this one, I really prefer to keep my word unless there's a real good reason not to. The thing is, I don't have a paddle here, and I think his siblings need to know that he did receive the promised punishment, so they won't think I'm being unfair when I keep a promise for them.
While I generally avoid car spankings (and while I don't think either car I'd use to pick up one boy would even work), if I really feel that I'm able to privately spank him without worrying about bystanders or police, and if he's really willing to bare himself in a car with even the chance of a passerby, I'll consider it. More likely, I'll share these thoughts with him, then we'll brainstorm a way to make his spankings at home more private.