According to Dean Swift, the 2nd Duke of Grafton was "almost a slobberer, without one good quality". Lord Waldegrave found him  "totally illiterate; yet from long observation and great natural sagacity he became the courtier of his time. He was a great teaser; had an established right of saying whatever he pleased." Nevertheless he was Lord Chamberlain to King George II and rumoured to have been the 
lover of this king's daughters, the Princesses Amelia and Caroline.
After having been in the army in Flanders, he was sent by Sir Robert Walpole to Ireland as Viceroy; when this was not a success, in 1724 he was appointed Lord Chamberlain which he remained until his
death.
The Duke of Grafton may have been able to say whatever he liked but he may not have been pleased by King George II's remark when he explained to the king that he went hunting for the sake of his health.
The king said, "that he on that account do better by walking or riding post"; and also that if there was any pleasure in the chase, he was sure the Duke of Grafton could know nothing of it, "for with your
great corps of twenty stone weight, no horse, I am sure, can carry you within hearing, much less within sight of your hounds."
In 1713 he married Lady Harriet Somerset, a granddaughter of the 1st Duke of Beaufort. They became the parents of seven children and she died in 1726. He never married again but drank and chased women.
In middle age he was the lover simultaneously of Princess Amelia and Lady Burlington. The latter was to become the mother-in-law of his son-and-heir, the despised Lord Euston. Fortunately he outlived his
childless son and was succeeded by his grandson, the son of his younger son.
 

Source: Leo van de Pas