"__We have become a grandmother__" is a phrase uttered by Margaret Thatcher, Prime Minister of the United Kingdom, in 1989. It has attracted notoriety for her usage of the Royal we- wikipedia 
We have become a grandmother. Quote by Margaret Thatcher - wikimedia
Thatcher made the remark on 3 March 1989 following the birth of her first grandchild, Michael Thatcher, the child of her son Mark Thatcher and his wife Diane Burgdorf. Thatcher made the statement to press gathered outside 10 Downing Street.
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We have become a grandmother. Quote by Margaret Thatcher - youtube
Her grandson was born close to the tenth anniversary of the start of Thatcher's premiership.
Dean Palmer, in his 2015 book ''[[#
Thatcher's Downing Street press secretary, Bernard Ingham, wrote in his diary that he would "never live down" the incident, as prime ministers are "thought to be intensively rehearsed before they utter a word to the world", but that the incident "add[ed] to the gaiety of the nation".
# Use of the royal we
Thatcher's biographer, Charles Moore, Baron Moore of Etchingham, after noting that the public interpreted the usage as an example of Thatcher's "pseudo-royal grandiosity", offered different explanations: that she had always had a perpetual embarrassment with using the word "I (pronoun)" to describe herself, and that perhaps she had been trying to include her husband, Denis Thatcher, in her statement. The expression should have been "we have become grandparents", not "a grandmother".
Dean Palmer felt that Thatcher's use of the royal ''we'' showed that it "seemed to the world" that Thatcher was losing touch with reality.
The Churchill Archives Centre, holders of Thatcher's papers, describe the comment as having caused "huge negative public reaction" as its use by a prime minister, as opposed to a member of the British royal family, coupled with Thatcher's "imperious personal manner" was "the source of considerable disdain at the time".