@Mohsin ***********
No need to mention family but if you want to bring your children (each must be under 20 and unmarried to be your dependent), you will need to fill out separate applications for each of them and be prepared with the statement to support them each with GBP13,000. Visa fees also payable per application. As for your wife, visa is not required. In case you want to be in Thailand alone( or children and wife already in Thailand), there are more visa options but to apply under DTV requirements for Digital Nomad/Workcation, as you implied you would, standard requirements and documents mentioned on the embassy website applied.