What is a step-cousin?
A step-cousin is related to you through a step-parent: the child of your step-parent's sibling. You are cousins by marriage, with no shared ancestor.
No shared ancestor, no cousin number. For blood cousins, use the cousin calculator; for a half-sibling link, see half cousins.
Your step-parent's brothers and sisters are your step-aunts and step-uncles, and their children are your step-cousins. Many families simply say "cousin".
Because there is no common ancestor, step-cousins share no DNA through that link, and no cousin degree or "removed" count applies. The cousin calculator only covers blood relationships.
A half cousin is different: half cousins share one grandparent, because their parents are half-siblings.
On a family tree, show the step-relationship by drawing your parent's second marriage as its own couple line; your step-parent's family then hangs from their own parents in the usual way.
To check a real pair of relatives, add them to the family tree maker and use How related?, or look them up on the cousin chart.
Questions
Are step-cousins blood related?
No. Step-cousins are connected only through a marriage and share no ancestor.
What is the difference between a step-cousin and a half cousin?
Half cousins share one grandparent; step-cousins share none.