Family firms are based on nepotism.  In two papers Jenny Ahlberg and I explore nepotism in family firms. 

The first paper offers a terminology of nepotism in family business.

Collin, S.-O. & Ahlberg, J. (2022). Nepotism in family firms - a terminology. Вчені зап. Харків. гуманітар. ун-ту «Нар. укр. акад.», т. 28, (Scientific collection of KhHU «People's Ukrainian Academy», vol. 28:171-185).

The second paper  makes a conceptual derivation of pros and cons of nepotism and present an empirical case analysis of nepotism.  (in process of publication, so you have to wait)