You kneel to acknowledge the tantrum feeling, and from across the room comes the commentary: "In my day, that would've earned a smack." Practicing gentle parenting around grandparents who raised kids differently is a double discipline event β you're regulating your childΒ and managing a critique. Here's the peace treaty.

Hear the sentence under the sentence
"You're spoiling him" usually isn't an attack β it's a defense. Your different approach can land on grandparents as an implied verdict on their parenting, and defensiveness comes out as critique. Answering the real message changes everything: "You raised great kids β I turned out okay! This is just the version I'm trying." Honor first, then hold.
Explain the goal, skip the vocabulary
Never defend gentle parenting with its jargon β "co-regulation" and "holding space" are eye-roll generators across a generation gap. Translate to outcomes any grandparent shares: "I'm trying to raise a kid who behaves when nobody's watching, and who still tells me things at fifteen." Then, if useful, borrow authority they respect: this is where pediatricians landed too β the discipline guidance at HealthyChildren.org reflects decades of evidence moving toward teaching-based, non-fear-based approaches. "The doctors changed the recommendation" travels better than "my parenting podcast said."
The two-tier boundary
Not every difference needs a battle, so sort into tiers. Tier one β their house, their small stuff: extra cookies, later bedtime, more TV at grandma's. Let it go entirely; kids handle different rules in different houses fine, and flexibility here buys goodwill. Tier two β non-negotiables everywhere: no shaming, no fear-based threats, no comments about the child's body or character. Stated once, privately, kindly, firmly: "However you handle rules is your call here β the one thing I need everywhere is no 'bad boy' talk. Correct the behavior all you want."
Recruit through the ritual, not the argument
The stealth conversion: hand grandparents the bedtime story job. A grandparent reading the story where friends repair a big fight, or where the sulking racer learns to congratulate the winner, is delivering your values in a format they'll never argue with β and most fall in love with the ritual itself. Many a skeptical grandparent has been fully recruited by a grandchild demanding "the Pip one" three visits running.
The line to remember
You don't need their agreement. You need their cooperation on two or three things, and their love β which you already have.
Honor the past. Hold the line. Hand them the book. π΅π
The grandparent-conversion kit: