Both China and Myanmar name each other "paukphaw". This is the Myanmar word for sibling or intimate. It is a reflection of the closeness of Sino-Myanmar relations that "paukphaw" is never used for any other country. The two have maintained substantive relations for centuries.
"Sino-Myanmar relations: analysis and prospects,"
Culture Mandala: The Bulletin of the Centre for East-West Cultural and Economic Studies:
2, Article 1.
Available at: http://epublications.bond.edu.au/cm/vol7/iss2/1