Jermo van Nes has produced a brief article for ETL which will be of interest to students of the Pastorals:

Jermo van Nes, “Who are ‘Our People’ (οἱ ἡμέτεροι) in Titus 3,14?” Ephemerides Theologicae Lovanienses 95.4 (2019): 661–65.

Abstract: ” All but one contemporary commentator on Titus interprets οἱ ἡμέτεροι in 3,14 as referring to all Christ-believers. Endorsing yet modifying the minority view, the present study on the basis of exegetical considerations suggests that the phrase more likely refers to Artemas, Tychicus, Zenas, and Apollos mentioned in 3,12-13.”