How do you tell your kids about polyamory?
Plainly, age-appropriately, and without making it a single big conversation. Most children of polyamorous parents absorb the structure as part of their family-shape rather than as a disclosure event, especially when parents introduce non-primary partners gradually.
Children of polyamorous parents typically do not need a single dramatic disclosure conversation. They absorb their family's shape from the texture of their daily life, and they ask questions when something specific puzzles them. The healthier patterns introduce non-primary partners gradually, talk about them by name in normal ways, and answer kids' questions as they come up rather than launching set-piece discussions.
Age-appropriate framing varies. Young children (under 8 or so) typically don't need explicit relationship-structure framing; they just need to know who the adults in their life are and that those adults love their parent and them. Older children may have specific questions as they grasp the difference between their family and friends' families; the answers should be honest, calm, and not over-explanatory.
What works. Introducing partners by name and role ('this is X, mom's partner') rather than by category. Answering questions when they come up. Allowing the child to develop their own relationship with each adult at their own pace. Not making the structure central to the child's identity if they don't want it to be. Letting them know they can talk to whichever adult feels safe about whatever is on their mind.
What helps less. Sitting children down for a single big 'we have something to tell you' conversation, which children typically read as 'something is wrong.' Over-justifying the structure ('it's actually fine, and here are five reasons why'), which signals that adults are uncomfortable. Insisting that the children frame their family the same way you do when they might prefer a different vocabulary. Hiding the structure from the children's friends or schools in ways that produce inconsistency.
What kids of polyamorous parents often tell researchers. They appreciate the wider network of trusted adults. They sometimes find peers' reactions confusing or hurtful. They develop early competence at handling questions about their family. They mostly turn out fine, in the boring ways child-wellbeing research measures.