If the veteran be deceased from service connected causes, the surviving husband or wife, child or children, or the surviving dependent mother, dependent father, dependent person standing in loco parentis, dependent brothers and dependent sisters, in the order named, shall be entitled to receive the difference between that amount which has been received by the veteran or his beneficiary under section 3, and the sum of $500.00, and in the event no payment has been made pursuant to section 25 of article 10, under the provisions of section 1a of Act No. 4 of the Public Acts of 1947, being section 35.901a of the Compiled Laws of 1948, or under section 3 of this act, the entire sum of $500.00 shall be paid to the person entitled thereto.