Is bonus mom an offensive term for step moms?

I’ve always thought it endearing. But curious. My sons (14mos) dad just got engaged to his gf (their relationship apparently overlapped ours so they’ve been together two years in the new year) and she has a “dog mom” sticker on her car so I was thinking to get a bonus mom one to add whenever they get married but I was thinking maybe some might be offended by that?

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