The surviving spouse or dependents of a peace officer of this state or of a political subdivision of this state who is killed as the result of active duty in enforcing the laws of this state or the laws of an adjoining state shall receive the sum of $1,000.00 for defraying the expense of last sickness and burial and $18.00 a week until a total sum of $5,000.00 is paid. As used in this section, (a) “surviving spouse” means the spouse of the peace officer, if living, and until remarriage (b) “dependent” means the children of the peace officer, if dependent; the mother, father, or both, of the peace officer, if dependent; and the brothers and sisters of the peace officer, if dependent; in the order named. If the peace officer does not leave a surviving spouse or any dependents as defined in this section, the estate of the peace officer shall receive the sum of $1,000.00 for the expense of the peace officer’s last sickness and burial.