Louise Julie was the first sister to attract the king followed by Pauline Félicité, but it was Marie Anne who was the most ambitious of them all and who was the most successful in manipulating him and becoming politically powerful due his inexperience in governing, his lack of confidence, and his timidity.

[2][3] In 1732, Diane Adélaïde's oldest sister, Louise Julie, caught the attention of King Louis XV and became his mistress, and was recognized as his maîtresse en titre in 1738.

In 1739, her younger sister Pauline-Félicité asked Louise Julie for an invitation to court, and when she arrived, she seduced the king and became his mistress.

Marie Anne demanded an official position at court and the title of duchess, together with a settled income sufficient to enable her to maintain that dignity and safeguard herself against any reversal of fortune.

[4][5] Marie Anne arranged her favorite sister Diane Adélaïde's wedding to the Duke of Lauragais, and secured her a dowry and the office of designated lady-in-waiting to the future bride of the crown prince.

[6] Directed by Richelieu, himself dominated by Madame de Tencin, Marie Anne encouraged the king to form an alliance with Frederick II of Prussia, and personally participate in warfare and visit the battlefield during the War of the Austrian Succession in 1744.

[7] It was rumoured at the time, that one of the methods by which Marie Anne kept the interest of the king was to periodically offer him a ménage à trois with her sister, Diane Adélaïde de Lauraguais.

Fearing to be at his deathbed, Louis XV was afflicted by a religious crisis and wished to renounce his adultery and mistresses and ask his wife for her forgiveness.

[citation needed] After her death, the king for a short time consoled himself with her sister, Diane Adélaïde de Lauraguais.