With two young kids I would consider filling my tyre once a week an inconvenience. I would repair it to reduce wear and tear on the tyre, and the risk of having to replace the tyre early. Especially because of the inconvenience/expense of a blowout on a motorway with two small children. Source: had a blowout on a motorway once. Fortunately covered by AA membership, but involved a couple of hours on the hard shoulder in the dark.