George W. Bush Says Bill Clinton Is His 'Brother From Another Mother'

Former Presidents George W. Bush and Bill Clinton broadcast their unlikely bromance on social media Tuesday when Clinton posted a picture of himself reading Bush’s new book.

Clinton’s #HowAreYouStillNotOnTwitter hashtag is a reference to his President’s Day tweet this year, which ribbed the younger Bush for not having an account. This time, Bush responded. He posted Clinton’s tweet on Instagram with the caption, “Thanks, 42! Hope you like the book about your pal, #41. #HowAreYouSTILLNotOnInstagram #PresidentialGrammers #BrotherFromAnotherMother”.

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This is not the first public display of affection between the two former presidents. Clinton often refers to himself as the “black sheep son” of the Bush family, and Bush challenged Clinton to the ALS Ice Bucket Challenge earlier this year. Their bipartisan friendship is all the more remarkable given that Clinton beat Bush’s father, President George H. W. Bush, in the 1992 election, ousting Bush Sr. after only one term in office.

Write to Tessa Berenson at tessa.berenson@time.com.