Bairnsdale (YBNS) may be an option if they have a car. I used to live half way between Bairnsdale and Lakes. Generally flew into Bairnsdale. They have fuel, no landing fees, big runways, not sure about casual hangarage though. Perhaps the family can combine picking you up with a visit to Paynesville and Raymond Island. Depending on the kids ages spotting koalas on the island is usually entertaining for awhile.