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it is likely that the time children spent on social media and video games on computers or laptops are much more than learning unintended by their parents.I'm not sure that unintended by their parents can modify the whole sentence.
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kongwu233It is likely that the time children spend on social media and video games on computers or laptops is ...

"... much more than learning unintended by their parents" is hard to understand. As far as it makes sense at all, it seems to mean that the learning is unintended by the parents. Do you mean that?

By the way, laptops are computers.