The Mount Scott Park Cemetery & Crematorium and the Lincoln Memorial Park Cemetery are one and the same. According to the Polk's Portland City Directories of 1926 and 1927, the name change came about sometime between these two years. Up through 1926 it was Mount Scott and in 1927 it was Lincoln Memorial. The address listed by the directory for both these names was the same: 1 Mile se Lents on Old Deardorf County Rd, South of Foster Rd 3, Box 310. The name Lincoln Memorial is the one used today, and the cemetery has an office and facilities for services. This cemetery is very large and beautiful. It is across the road from the Willamette National Cemetery which is used for those who served in the military and for their spouses.
I didn't look for any obits on the STUART family, as I saw Ellie had taken care of your request on William W. STUART. Using Ancestry.com Oregon Death Index, I found a death date for someone named "Bernadin C. McCORD" who died in Multnomah County, 18 Feb. 1974. The index said she was born April 1905, was age 68, and her spouse was listed as Richard. The 1920 census, Multnomah County, Oregon shows Bernadine, age 14, born in Minnesota, living with her parents, Charles and Oma AGER. The age of 68 at death, for this Bernadin, seems about right for Bernadine on the 1920 census so she may be the daughter of Charles and Oma.
Oma Mae (STUART) AGER died 10 Sept. 1958, in Multnomah County, Oregon. Charles H. AGER died 13 November 1962 in Multnomah County, Oregon.
I'll look at the newspaper for an obit, death or funeral notice for Charles AGER and see if there is mention of survivors. Maybe it will show Bernadine had moved back to Portland between the death dates of her mom and dad.
Using the same Ancestry.com Oregon Death Index, I found a listing for: Nancy Jane STUART, who died in Portland, Oregon 24 Feb. 1926, certificate #569. This Nancy may or may not be related to you.
I should be able to get to the library in the next couple of days and will see what I can find in the Oregonian newspaper on Bernadine, Charles and Nancy. Maybe there will be a list of survivors to prove this Bernadine and Nancy are related to you and the information will help you in your research.