The following documents are required for a relationship certificate in favour of Bangladeshi expatriates residing in Thailand:  

01. Valid original Passports along with the photocopies. 

02. Visa copies and a valid work permit copy. 

03. Birth Certificate(s) or a marriage certificate. 

04. An Application from the applicant. The form is available here.

05. The consular fee for a relationship certificate is Baht 110. ( Fee is Non-Refundable)