Can children under age 26 be covered as dependents on their parents' plan if they are eligible for their own coverage, e.g., at another job?

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• My child is about to turn 26, what do I need to do to remove him or her from coverage?
• Can a dependent be dropped from coverage in the middle of the plan year?
• What dependents are eligible and what required documentation do I need to submit for verification when adding a dependent?
• How do I add or remove a child covered as a dependent under another plan?
• If two employees in the same plan (state, local education or local government) are married, are they required to choose the employee + spouse premium level, or can each sign up for employee only coverage? What if there are children?