I would say the best option is to invite a couple (sailors preferred) who are good with their kids, or perhaps a couple with one child similar in age. The biggest advantage would be having another adult(or 2) to help with picking up moorings/etc who is not also tasked with watching the kids. While having some experience would be nice, just having other adult will lessen stress on your wife for these times.

When docking, having adult watching for safety of smaller kids is of utmost importance.