I didn't fnd an obituary in the Oregonian for David, only a death notice. Ross Hollywood Chapel was in charge of the arrangements and they may have a copy of his obituary if one was published.
Name: Brauer, Amalia County: Washington Death Date: 3 Jul 1980 Certificate: 80-12702 Age: 87 Birth Date: 19 Mar 1893
Since Amelia died in Washington Co., you might try there for David's obit. For Amelia there was this funeral notice:
Sunday Oregonian July 6, 1980 Page D4 Brauer, Amelia; sister of Lydia Sinner and Julia Becker; aunt of Wilma Page; several other nieces and nephews. Services Monday, July 7, 1 pm. Ross Hollywood Chapel, NE 48th and Sandy Blvd. Friend invited. Entombment Riverview Abbey. Member of Rivercrest Community Church. Family suggest contributions to Rivercrest Community Church bldg. fund.
If Marie Metzler's husband's name was Adam, she died October 18, 1933, in Portland.
Oregonian Oct. 20, 1933 Funeral services for the late Marie Katherine Metzler, aged 73 years, of 4527 NE14th ave will be conducted Friday, Oct. 20, at 2 pm from the Zion German Congregational Curch cor. E 9th and Fremont. Friends invited. Interment Rose City Cemetery. Remains at Pearson's Funeral Church.