There is not much relationship between the two masters except a surname.
Tong Yanfang, 1946, from Ninghai, Zhejiang. No, Yanfang, don't sign up for Bobby Zhai. Love ibis. Learn from Chu Sheng. At present, he is a painter of Shanghai China Painting Academy, a national first-class artist, vice president of Xiling Printing Society and director of identification collection research office, member of seal cutting committee of China Calligraphers Association, deputy director and secretary general of seal cutting committee of Shanghai Calligraphers Association, member of seal cutting committee of China Calligraphers Association and vice chairman of Shanghai Calligraphers Association.
Tong Danian (1874 ~ 1955), whose real name is Yi, the word is awake, the word is reassuring, and he works as a heart shrine, and he is the fifth son of Matsushita in the Twelve Peaks of Jin 'ao. He lives in Anju, Yigu Road and Xuefeng, and is from Chongming.
I hope the answer can help you.