What does it mean when a guy mentions his mum a lot?

We’ve met 3 weeks ago online just before lockdown and have been texting pretty much everyday. More recently he shared a picture of him with his mum and brings her up a lot during conversations. He says things like “oh when my mum has had a bad day I do this for her”, “right now I’m making her dinner”. Apparently he’s very close to her.
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Yes but the fact he mentions his mum/family is it a sign that he’s serious about?
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