What happens to the family member trying to mediate between a blended family's loyalties?

The Peacemaker burns out. Kris Kluver, in The Dysfunctional Family Office, calls this pairing The Second Marriage plus The Peacemaker, which produces an Impossible Position. The Peacemaker holds together a family fractured by competing loyalties. They mediate between biological children and step-relationships. They translate. They smooth. They show up at every difficult dinner. They burn out in the middle. The pattern is one of the hardest in UHNW families because the Peacemaker often becomes load-bearing for relationships that wouldn't survive without them. The family relies on their work and rarely acknowledges the cost. The Peacemaker's own life shrinks while everyone else's continues. The fix requires the founder, the new spouse, and the older kids to take responsibility for their own relationships rather than offloading the work to the Peacemaker. The Peacemaker also has to stop volunteering for the role. Both sides have work.