What are the requirements for applying for a Non-O visa in Thailand and how to open a Thai bank account?

The Non-O visa allows expatriates to stay in Thailand based on family connections, such as having a Thai child. Applicants can start the process by applying for the 90-day Non-O visa from a Thai embassy outside Thailand, where they can use funds from any personal bank account, including foreign banks. Once in Thailand, they can open a Thai bank account to meet the financial requirements for visa extensions. However, a birth certificate may not be sufficient for opening a bank account; additional documentation may be needed, like a residency certificate. Additionally, extensions for the Non-O visa beyond 90 days may require proof of guardianship.