<text>  A new biography of Michelle Obama has revealed that her mother was initially suspicious of her future son-in-law because he was of mixed race. Barack Obamas father was from Kenya and his mother was a white woman. His parents met in Hawaii although his father abandoned his family when the future president was aged just two. The claim is contained in a new biography of the First Lady written by Washington Post correspondent Peter Slevin. Scroll down for video . Marian Robinson, far right, went on a visit to China in March last year, accompanying the First Lady, center, and her grandchildren Sasha, far left, and Malia . A new biography of Michelle Obama, right, claims that Mrs Robinson, second left, had reservations about her daughter marrying a man of mixed race, but the future president soon won over his mother-in-law . However, despite her initial reservations, Marian Robinson, 77, was soon won over by the high-flying lawyer who had serious political ambitions. As part of his research into Mrs Obamas life, Mr Slevin uncovered an interview with WTTWs Chicago Tonight show where Mrs Robinson addressed the issue of race. She told the interviewer that his mixed-race heritage did not worry her. That didnt concern me as much as had he been completely white. Mr Slevin told the New York Daily News that Marian, no pushover, was favorably impressed with Barack. Barack Obama married Michelle, pictured on October 18, 1992 in Chicago, Illinois . Mr Obamas mother-in-law moved into the White House after he became president to help with their two children Sasha and Malia. She has travelled with the Obamas, accompanying them on several trips including visits to Africa and China. The book, Michelle Obama: A Life is being released on April 7 by Alfred A. Knopf for 27.95 on hardback. According to the publisher, the book is An inspiring story, richly detailed and written with élan, here is the first comprehensive account of the life and times of Michelle Obama, a woman of achievement and purposeand the most unlikely first lady in modern American history. With disciplined reporting and a storytellers eye for revealing detail, Peter Slevin follows Michelle to the White House from her working-class childhood on Chicagos largely segregated South Side. As part of the process to complete the book, Mr Slevin interviewed several members of the Obama familys inner circle. The publishers added: Slevin deftly explores the drama of Baracks historic campaigns and the harsh glare faced by Michelle in a role both relentlessly public and not entirely of her choosing. He offers a fresh and compelling view of the White House years when Michelle Obama casts herself as mentor, teacher, champion of nutrition, supporter of military families, and fervent opponent of inequality. The book, Michelle Obama, A Life by Peter Slevin is being released on April 7 for 27.95 by Alfred A. Knopf . 