By Andrew Gould The Las Vegas Raiders are retaining Deuce Gruden, son of former head coach Jon Gruden, as their strength and conditioning coach. Deuce Gruden joined his father’s coaching staff when the Raiders hired the older Gruden as head coach in 2018. He stayed on board after Jon Gruden resigned in light of racist, misogynistic, and homophobic emails revealed last season. The Raiders announced their 2022 staff under new head coach Josh McDaniels on Monday. In 2016, Deuce joined Washington’s staff as an intern while his uncle, Jay Gruden, served as head coach. He got promoted to an assistan…