How can a family of six extend their stay in Thailand on a tourist visa for an additional two and a half months?

A family of six on a two-month tourist visa in Thailand, expiring soon, is seeking advice on extending their stay by an additional two and a half months. Suggestions include traveling to Laos to obtain a new tourist visa valid for 60 days, which can potentially be extended for a further 30 days. They may also seek extensions directly from Thai immigration, depending on their nationality, with some only eligible for a 7-day extension.