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How are the Chinese languages related to the Sino-Tibetan language family?

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Shang dynasty: oracle bone inscriptions — Chinese languages Oracle bone inscriptions from the village of Xiaotun, Henan province, China; Shang dynasty, 14th or 12th century bce.

The Chinese languages, collectively referred to as Sinitic, constitute one of the major divisions of the Sino-Tibetan language family. This family is generally divided into the Sinitic branch and the Tibeto-Burman group.12

The relationship between these languages is based on the hypothesis that they derive from a common ancestral source, a connection supported by phonological correspondences in shared basic vocabulary. Linguists have identified sound resemblances between Old Chinese and Old Tibetan that suggest a genetic link rather than coincidental similarity.3

While Sinitic is distinct from Tibetic and Burmic branches in terms of morphology, syntax, and phonology, the entire Sino-Tibetan area has undergone massive structural convergence over millennia of intense language contact. This long history of interaction makes it challenging for scholars to distinguish between genuine genetic cognates and ancient cultural borrowings. Consequently, while the Sinitic languages are firmly placed within the Sino-Tibetan family, the exact nature of their divergence from other branches remains a subject of ongoing linguistic study.42