My Mother’s Second Husband Was Designated as Her IRA Beneficiary; however, He’s Submitted Funeral and Palliative Care Expenses to her Estate

My Mother’s second husband was designated the beneficiary of her IRA; however, he’s submitted her funeral and palliative care expenses to her estate. My sister and I are named the beneficiaries of her estate. Her estate is modest, approximately 300K, which includes her condominium. My sister and I are named in her will as her estate’s beneficiaries. As her spouse, can he legally require the estate to pay these expenses when there are both joint accounts and the IRA that have funds?