Final answer:
Parent-child incest is often considered to create the most trauma due to the violation of trust and power dynamics in the parent-child relationship.
Step-by-step explanation:
The type of incest that is often considered to create the most trauma for the victim is parent-child incest. This is due to the power dynamics and trust violations inherent in the parent-child relationship. When a parent, who is supposed to be a caregiver and protector, becomes an abuser, it can have profound and long-lasting effects on the victim's mental and emotional health. Incestuous relationships within the immediate family, such as with siblings or extended family members, also carry traumatic potential, but the fundamental transgression of the protective parental role makes parent-child incest particularly damaging.