Zeng Shen, a famous jade son, is said to have written the filial piety (one of the last thirteen classics).
Zeng Shen's father's name is Ceng Dian. Ceng Dian is also a student of Confucius. In other words, both father and son are students of Confucius.
In this way, both father and son learn from Confucius, and there are several couples among Confucius' students.