Doubt that would make a difference. If they don't even fly a few times a year, you won't even see them at the airport at all. Although, as an OWE, I was once encouraged to bring my entire travel party of 4 to the priority lane - 2 of them on separate bookings.

It might work better if they use the same guest entitlement as the lounges - Silvers can only bring themselves, Gold can bring 1 guest, DM can bring 2. If the whole family is travelling, you will get priority anyway if you have young children. Otherwise, everyone is is basically an adult (or approaching adult age), and should be treated as any other pax.