His Father's son...in 2 very distinct ways

Despite the fact that he pretty much looks exactly like
his father, below is evidence that solidifies beyond a shadow of a doubt that Will is most definitely Scott's son.

#1. A love of Rush ( in this case, the band...not the talk show host). Will is working toward his Geddy Lee status (yes, I know Geddy mostly plays the Bass but this is close enough).

#2. They dance alike: