Paternal grandmother: born 10 August 1927, died 7 February 2003, aged 75 years, 181 days (cause of death: complications from diabetes)

Maternal grandfather: born 11 September 1919, died 13 July 2006, aged 86 years, 305 days (cause of death: pulmonary embolism)

Maternal grandmother: born 29 December 1918, died 14 September 2011, aged 92 years, 259 days (cause of death: pneumonia)

I could go one further generation back, but as I currently only know the exact lifespans of 5 of my great-grandparents, I'll probably add to this thread again once I learn the relevant information regarding the other 3.

Paternal grandmother: (3 April 1936-) 89+
Paternal grandmother's father: (1 November 1898-9 November 1993) 95
Paternal grandmother's mother: (5 August 1917-29 October 1997) 80 

Maternal grandfather: (1933-26 December 1998)
Maternal grandfather's father: Unknown
Maternal grandfather's mother: Unknown

Maternal grandmother: (6 November 1940-) 84+
Maternal grandmother's father: (30 January 1911-23 May 2001) 90
Maternal grandmother's mother: (25 June 1915-4 March 2002) 86 

I did some research about my father's family and I filled some blanks. I even managed to find and buy a book written by my great-grandfather (father of my paternal grandfather) published in 1911 (it's about Christianity).

https://www.legacy.com/us/obituaries/legacyremembers/peter-miller-obituary?id=56802948

Father’s side:

Grandmother: May 10, 1934-May 23, 1999 (aged 65)

Grandfather: September 17, 1932-November 16, 2024 (aged 92)

Mother’s side:

Grandmother: August 31, 1938-Present (alive at 86)

Grandfather: July 7, 1932-January 23, 1993 (aged 60)

Rest in peace, Grandma (1944-2023). Thank you for everything.

It's been two years without a grandparent. I miss them tremendously.

what an immense loss. There are no words. I only can say that I feel deeply with you. 

May your beloved grandmother rest in eternal peace. In you she will live on.

Sincere condolences