After the ruin of the Taira clan in 1185, he and his mother escaped to Thuda sho, Gamo gun (Gamo District), Omi Province, and his mother became the wife of a local clan member in Tsuda. and at this time he also began to use the surname of Tsuda.
寿永4年（1185年）の平家滅亡後、彼と母は近江国蒲生郡津田庄に逃れ、そこで母は津田の土豪の妻となり、親真も苗字を津田と名乗ったとされる。