As you know, access without notice is a violation of your rights as a tenant. I would hire a landlord-tenant attorney to put the owner and management company on notice that entry is not permitted without adequate written notice and may be grounds for your termination of the lease.
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You are entitled to "quiet enjoyment" of your rental unit. Document the intrusions upon your privacy and the fact that you have notified the owner and the management company that the owner and/or her son are not to enter without 24 hours prior notice. If she continues this practice, you would then have a reason to give 30 days notice of your intent to vacate for her breach of your lease. They may just let you go, or they may try to enforce the lease. But, if they do try to enforce the lease, you have a good defense based on the owner's behavior.
Best of luck to you,
John J. Keenan
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I agree with my colleagues. It sounds like you are going to need to have an attorney write to the management company and the lawyer insisting that this behavior stop. If they fail to do so, then you would be within your rights to break the lease.
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