“We have become a grandmother.”
Statement to the press on the birth of her first grandchild (3 March 1989) http://www.margaretthatcher.org/speeches/displaydocument.asp?docid=107590
Third term as Prime Minister
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Margaret Thatcher 348
British stateswoman and politician 1925–2013Related quotes

“My grandmother wanted me to have an education, so she kept me out of school.”

Letter to Emily Holmes Coleman (2 February 1934) http://www.case.edu/artsci/engl/VSALM/mod/brandelmcdaniel/index/library.htm

“Christian theology is the grandmother of Bolshevism.”
Source: The Hour of Decision

Ólafur
Heimsljós (World Light) (1940), Book Four: The Beauty of the Heavens

Variant: My grandmother started walking five miles a day when she was sixty. She's ninety-seven now, and we don't know where the heck she is.