Is it normal for my girlfriend to shower with my neighbours 4 year old son?

My girlfriend babysits her neighbours 4 year old son. And when she takes a shower she brings him in there and they shower together.

I told her this is very inappropriate. Her excuse is that if she leaves him alone he’ll wreck stuff. Is this normal? I kinda feel like it’s grounds for a breakup
Is it normal for my girlfriend to shower with my neighbours 4 year old son?
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Is it normal for my girlfriend to shower with my neighbours 4 year old son?
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