Barbara Bush married George H.W. Bush in 1945. They had six children and have been married longer than any presidential couple in American history.
The former first lady enjoys a close relationship with the Bush twins. They affectionately call her "Ganny."
In the twins' 2017 memoir, Sisters First, Bush Hager recounted how their grandmother had taken them on their first trip to Italy when they turned 16. They visited the traditional sites — museums, ruins and cathedrals — but Barbara Bush also took the twins to a bar and bought them their first martini.
Bush Hager also described her grandmother's bluntness, which earned her the nickname "The Enforcer."
The younger Bush twin said she had "put on a show" during a family tennis tournament she had recently organized at her grandparents' summer home in Maine. A few weeks later, she received a stern letter from her grandmother.
"Like a lawyer building her case, Ganny recited my every unsportsmanlike infraction, from lifting my skirt to the cheers I had chosen to yell in the heat of the moment," Bush Hager wrote. "And what was worse, in her eyes, was that I had done it all in front of my mom, my daughters, family guests, and most of all, Gampy, who had been raised with the highest standards of sportsmanship."
Source : https://www.dallasnews.com/news/texas/2018/04/16/jenna-bush-hager-gets-teary-eyed-grandmother-barbara-great-spirits228