This Alan Brooks appears not to be a son of Alvin and Rosie, unless his siblings all died before 1997.
He was born in Toledo and died 21 Dec 1997 in Montgomery, MI at age60. No siblings are shown as surviving him. His survivors were wife, Wilma Bohn whom he married Jan. 11, 1958; 2 daughters; one son and 5 grandchildren.
The obit probably was published in the Toledo newspaper as his one daughter then lived in Maumee, a Toledo suburb. Montgomery is about 85 miles west-northwest of Toledo.