You can sometimes hear a person’s strongest influences and mentors in the way that they speak. They may share unusual phrases, similar filler words, or familiar speech patterns. More simply you’ll just think “Person A sounds like Person B.” Seems to be a function of time spent by Person A listening to Person B.

This isn’t exactly it but it’s close:

This isn’t exactly it but it’s close: https://en.m.wikipedia.org/wiki/Communication_accommodation_theory

Language is fun, we breathe in the ideas and mannerisms of those around us like cultural atmosphere and it shapes us without us realizing.