You can leave your kids with an older child if the child is at least 11 years old. That is okay in California.
Don't let your roommate harass you! YOu can tell him that you're going to take him to criminal court for harassment and to landlord-tenant court for eviction.
Now you need to tell him to stop harassing you or you will talk to the DA at the criminal court.
You also need to get him out of your apartment for many reasons -- the landlord can have YOU evicted because you have too many people in the apartment. If the apartment lease is in your name, then you are violating the lease and you have to evict him. Ask him to leave. If he will not leave, you must serve him notice to leave. You will want help from a landlord-tenant attorney. Don't discuss this with the landlord -- just do this on your own. Ask the roommate and his family to leave. If they don't leave you must evict them through the courts.
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