While Kim skirted spelling out just how serious she and Pete ... there's plenty of visual evidence now.
TMZ broke the story -- Pete's met her kids, or at least one of them. We got this video of PD and North as they tooled around in a golf cart in Scott Disick's gated L.A. community. ... which is not far from Kim's home.
Kim and Pete have been a thing for about 6 months, and now that he's getting closer and closer with her family -- fair to say it's plenty serious.