Research on communication patterns in stepfamilies reveals several different communication patterns. In which pattern do the child and the biological/adoptive parent maintain interaction, but the stepparent remains pretty much irrelevant to the child’s life?
a. outsider triad
b. linked triad
c. adult-coalition triad
d. complete triad

Explanation: outsider triad is a type of communication whereby the child is primarily communicating with his residence parents with limited awareness of his stepparents. Relating this passage with outsider communication, it can be deduced that since the stepparents are irrelevant to him in terms of communication, the type of communication is outsider triad communication.

Other forms such as complete triad is formed when the child see a real family such as both type of parents are seen as one family which doesn't relates to the passage, adult coalition triad explains misunderstanding between the parents which is also related to the passage and lastly linked triad which explains a type of communication were the child communicates with the other parent through one parent.

The best triad that relates to the passage is Outsider triad