1. When a member of the department dies from any cause whatever while a member of the department or after retirement under the provisions of sections 86.510 to 86.577, and leaves a widow surviving, the board of trustees shall pay such widow from the pension fund, monthly, while unmarried, a sum equal to one-half the monthly pension which her husband received or would have received had he been retired on the date of his death or the sum of seventy-five dollars monthly, whichever is the greater amount. No pension shall be paid to any widow of a pensioner who has been retired on account of twenty years or more of service, unless she was married to the deceased pensioner at least five years immediately prior to the date of his retirement.

2. If there be any surviving children of the deceased member or pensioner under eighteen years of age, the pension payable to the widow shall be increased ten dollars per month for each dependent child if the decedent leave no widow, but does leave an orphan child or children, under the age of eighteen years, the child or children, collectively, shall receive a pension of thirty dollars monthly until the youngest child attains the age of eighteen years, but no child shall receive any pension after attaining the age of eighteen years.