California E&S Insurance

[Landlord US-CA] Tenant threatening to sue for being required to purchase Renters Insurance Hello Everyone. I'm making this post for my father because he is a Landlord that owns apartments and has come to an altercation with a tenant. Under the original contract the tenant was not required to purchase Renters Insurance but my father wanted to cover more bases and decided to now make it a requirement. The tenant was given a 60-day notice for a Change of Terms to the contract that now requires the Tenant to purchase Renters Insurance. The tenant is refusing to comply with the change of terms (purchasing renters insurance) and is threatening to sue. Our concern over this is, can the tenant seriously or legitimately sue because of this requirement? As said before, he was given a reasonable 60-day notice for Change of Terms. My father plans to speak with an attorney about this as well but we're unsure if the tenant really plans to sue or is just leaving it at a threat. Any help is appreciated. Edit: it is a month to month lease Edit 2: Thanks everyone for the information and advice. I will report back with what the attorney has said on the matter when my father meets with them. Have a blessed day

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  "title": "[Landlord US-CA] Tenant threatening to sue for being required to purchase Renters Insurance",
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