Your step son can be your father if he was previously married to your mother, making him your step father.
Matthew is either the son or step-son of his father's wife.
step brother
Your mother's new husband is your step-father and you are his step-son or step-daughter.
Can't happen unless there's some step-relationship here, such as a man marrying his step-mother, the wife of his father. That still makes you your father's son in any case, but now you have become your father's step-father. Real messed up relationship & family here!!
Your Step-brother. If he isn't your brother but he is your father's son, he's you.
Biologically - No. If that person is a step-father - Yes
Step father and son
The doctor is his MOTHER!! Unless his mother is dead well then its his step father
George Washington, the Father of Our Country, had 2/two step-children from his wife's, Martha's, previous marriage. 1(one) step-daughter and 1(one) step-son.
Your mothers husband would be your step father and you would be a step son or step daughter.
When your mother remarries a man he becomes your stepfather (assuming you are son or daugther)