"Toledo Blade", Thursday, April 4, 1940: Rudolph Sibberson, 26, of 2660 Norwalk Avenue, died yesterday following an illness of four weeks. He is survived by his wife, Madonna; children, Richard, Madonna and Judith; brothers, Louis, Henry, Christ, Ernest, Carson, Frederick and John; sisters, Mrs. Anna Autonoff, Mrs. Marie Cousino and Mrs. Emma Grodie. Services will be at 1:30 p.m. Saturday in the James Clegg Memorial. The Rev. Frederick Lambertus will officiate. Burial will be in North Oregon Cemetery.
I couldn't find any marriage record for Rudolph and Madonna in Lucas County, 1928-41.
There is a Richard SIBBERSON, about 68 years old, living in Toledo. If he is Rudolph's son, perhaps he knows when/where his parents were married.