Wade's divorced mother is the custodial parent and she married a man with three children of his own. what type of family does wade live in?

Wade lives in a "complex stepfamily".

Complex stepfamily refers to a family system where from both parents at least one has kids who are actually not related to him/her genetically, like in the given example Wade is not genetically related to his new father and his new siblings are not genetically connected to Wade’s mother.