Hi Cheryl,
Thanks. The book has been searched and it seems they are not listed, so I guess there's no stone. I'll call next week and see what the office says.
From Diario de Noticias, June 5, 1934:
Counting 43 years of age, passed away this morning Mrs. Joaquina de Medeiros Pereira, wife of Mr. João Pereira, of number 56 Clifford Street and mother of Mrs. Maria de Medeiros, 179 Show Street, Beatriz, João and Manuel Pereira.
The deceased was born in the parish of Ribeira das Tainhas, S. Miguel, Azores and had been in this country for 32 years.
In addition to the widower and children mentioned above, she leaves her mother Mrs. Perpetua de Medeiros and a grandson.
The funeral, in charge of the agency Antonio J. Anthony & Co., 369 Main Street, North Fairhaven, will take place on Thursday, at 8:15 am, in the church of the Immaculate Conception, where there will be a solemn mass of "requim " at 9 o'clock.
The corpse will be buried in the cemetery of S. João Baptista in the family lot.
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So the obituary doesn't say what section the family lot is. Because Joaquina was the only child of Perpetua to live to adulthood, I figure they'd be together. Joaquina's husband died in the 1970s, but he's buried with wife 2. I'll call next week and see if I can find out more.