Silver Sparrow by Tayari Jones
MY FATHER, JAMES WITHERSPOON, IS A BIGAMIST.
Dana and Chaurisse are sisters who have never met. The only thing binding them together is the life-changing secret of their father's double life. Only one of them knows the truth about James and his hidden family.
When the girls do finally meet and become friends, the fragile promise that has kept his secrets safe for so long threatens to implode.