From the Deseret News, here is the familial connection, Critchlow included:

Oct 20, 2019
9:21:49am

mrphotogenic All-American

As a grandson-in-law, Critchlow seems to be more family than the distant relative Romney brothers...

Reeling BYU, No. 14 Boise State both dealing with injury questions at QB as rivalry game approaches

Cougars coach Kalani Sitake said BYU starting QB Jaren Hall is day to day with concussion symptoms, while Broncos coach Bryan Harsin said BSU starter Hank Bachmeier’s hip injury is not season-ending

https://www.deseret.com/2019/10/14/20913900/reeling-byu-no-14-boise-state-both-dealing-with-injury-questions-at-qb-as-rivalry-game-approaches

Critchlow, who is married to the granddaughter of former presidential candidate Mitt Romney, a distant relative of the Romney brothers, has more game experience than Baylor Romney, but was bypassed last week for the backup QB spot because he doesn’t run as well, Sitake said.