There is no relation that is properly called a step cousin.
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No. Step cousins are not related to anyone in your family, other than perhaps your step-siblings or step-parent.
Cousins will show up as the children of your parent's brothers and sisters. You would want to show a descendant tree of your grandparents.
Second cousins are the people in your family who have the same great-grandparents as you, but not the same grandparents.
Your son and your great nephew (brother's daughter's son) are first cousins, once removed (i.e there is one generation separating them in the family tree) .
Second Cousins