Are Thais and Dai people in China the same ancestor?

Thais and Dai people in China share a common ancestor.

Dai people, that is, "Dai Tai people", call themselves the pronunciation between "di" and "tài". They are one of the ethnic minorities in China and the main ethnic groups in Thailand and Laos. Dai people originated in the middle and upper reaches of Lancang River and Nujiang River, and established political power in Yunnan-Guizhou Plateau many times. Later, due to the oppression of the Central Plains Dynasty and other ethnic groups, it gradually moved to Indochina Peninsula and South Asia subcontinent, and distributed in Thailand, Laos, Myanmar, India, Viet Nam, China, Cambodia and other countries.