Minor children can not be members (owners) of an LLC, nor can minor children own title to real property. However, posed with the same question in my practice last year, there were other ways to achieve the same goal. See a good estate planner.
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I agree with the prior answer. Minor children lack legal capacity by virtue of the fact that they are minor children to own property in their name and to enter into legal contracts. In fact, if a minor child was the beneficiary of a life insurance policy, parcel of real property or an interest in an LLC, a person would have to petition the court to be appointed the guardian of the child to control those assets (under court supervision) until the child turned 18.
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When I looked into this issue, I came up with a different answer than my colleagues.
One becomes a member of an LLC by entering into the operating agreement. I found nothing in the CA Corporations Code that precludes a minor being a member. Furthermore, minors can enter into agreements - BUT those agreements are subject to being disaffirmed (rejected) by the minor (please see post at the link below).
Accordingly, I found no reason why a minor cannot become a member of an LLC, though the possibility of disaffirmance could make it risky for the other members and for the LLC to have an minor member.
Disclaimer: This post does not constitute legal advice and does not establish an attorney-client relationship.