If I have a one year multi entry non imm O based on marriage to a Thai, is it possible to get an extension of stay based on supporting my half Thai children?
As well as being the father on the birth certificates and them all having my name I also have the documents from the courts naming me as a legal guardian.
If it possible what are the requirements for the extension? Banked money etc.
TLDR : Answer Summary
You can extend your stay in Thailand with a multi-entry Non-Immigrant O visa based on being the legal guardian of your half-Thai children. The financial requirements for this extension are similar to those for a marriage visa, specifically requiring either 400,000 baht in a bank account or a monthly income of 40,000 baht. However, extensions based on raising half-Thai children do not have the 2-month seasoning requirement for the banked money that marriage extensions do. Documentation, including birth certificates and court orders naming you as the guardian, will be necessary. It's recommended to check with your local immigration office for any additional requirements.