Rabbi Pinchas Ben Yair
From Zissil
Rabbi Pinchas Ben Yair was a 4th generation Tana and was either the father-in-law or the son-in law of Rebbe Shimon bar Yochi. He was known for his attachment to he Mitzovs of Masser and Pidyon Shevuim. Rabbi Pinchas Ben Yair is buried at the end of the old cemetery in Tzfas.
Association With Rashbi
In the Zohar it refers to him as the Rashbi's father-in-law while in the Talmud he is referred to as his son-in law. It is possible that there were to Tanaim named Rebbe Pinchas Ben Yair one a father-in-law and the other a son-in law of the Rashbi.