Dear Annie: My ex's new wife is parenting my kids like they're hers, and it hurts

A parent is seeking advice on how to establish boundaries with an ex-husband's new wife who is parenting their children as her own. The individual expresses hurt and wants to address the situation without appearing jealous. The request seeks guidance on communicating effectively with the ex-spouse.
How can I talk to my ex-husband about setting some reasonable boundaries without sounding jealous?
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