What do we do when co-parents disagree about boundaries?

The short answer

Do not try to make two adults identical. Agree the few outcomes that must remain dependable across care: immediate safety, health plans, another person's rights, essential handover information and any routine where abrupt changes create serious difficulty. For each, write what is fixed, what can differ between homes, what support the child uses and what each adult will do. Discuss disagreements away from the child and avoid asking them to carry messages, prove what happened or choose which parent is right. Compare observations rather than labels: the request, conditions, child response, adult response and aftermath. Trial one workable plan for a set period, then review its effect. Ordinary household preferences can differ if the child knows what applies where. Seek mediation or professional input when conflict prevents healthcare, education or safety planning, or when one parent is afraid of the other.

• Aim for dependable outcomes, not identical households or personalities.
• Separate safety, health and rights from ordinary household preferences.
• Keep adult disagreement away from the child and use direct adult communication.
• Compare observable patterns and trial one plan with a review date.
• Seek outside help when conflict blocks essential support or feels unsafe.