The grandson of Solomon Welker, He lost his family: parents and grandmother at age 9, and had the misfortune of witnessing it, Slaughter himself deliberately letting Joshua live just for the fun of someone full of vengeance wasting their life on him. 

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But Solomon seeing this, was the one enraged the most as he dragged himself to his grandson's side. and it was both loss and witnessing Solomon's strength that inspired Josh to live for his family and try to protect it.

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Josh considers Esther and then later Rujo to be his older siblings, and with Solomon's wisdom, Joshua grew into a Cold Blood squad captain with an eye for strategy and tenacious yet cool headed leader.