Is it normal for a guy friend who has a girlfriend to introduce me to his mom?

for context he just randomly one day he invited me to talk to his mom because she’s an artist as well as me. previously from that he also wanted to go to eat breakfast and go to a book store. yes he has a girlfriend i see him as a cool friend i just met him a couple months ago too so im utterly confused.

Is it normal for a guy friend who has a girlfriend to introduce me to his mom?
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