"We have become a grandmother" was a phrase uttered by Margaret Thatcher, Prime Minister of the United Kingdom, in 1989.

[3] Dean Palmer, in his 2015 book The Queen and Mrs Thatcher, wrote that Thatcher emerged from Downing Street at "great speed" and that she was dressed in "oversized" pearl earrings, a purple coat trimmed with fur and "blonde hair as rigid as fibreglass".

[5] 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".

[3] Thatcher's biographer, Charles Moore, 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" to describe herself, and that perhaps she had been trying to include her husband, Denis, in her statement but made a simple slip of the tongue: the expression may have been intended as "we have become grandparents", rather than "a grandmother".

[4] The Churchill Archives Centre, holders of Thatcher's papers, describe the comment as having caused a "huge negative public reaction" to its use by a prime minister, as opposed to a member of the royal family, coupled with Thatcher's "imperious personal manner" was "the source of considerable disdain at the time".