In contrast to most European Royal couples, George III and Charlotte had a harmonious marriage. (Read the comments of Mrs. Delany and Fanny Burney regarding the King and Queen.) On the other hand, during their lifetimes the English court had the reputation of being the dullest in all of Europe because of their notoriously frugal, plain, and pious life-style.
"Queen Charlotte garbed as a domestic, is frying sprats, with coins spilling from her patched and bulging purse; George, in undress, is toasting the muffins for tea. These caricatures were published by Gillray in 1791." In: Guttmacher, Manfred S. America's Last King. New York, 1941. Plate facing p. 174.
The King and Queen were conscientious parents. The King attended personally to the details of his childrens' care and education. He also appears to have been a loving father, as evidenced by this story about the London Hurricane.
The royal couple were very progressive in having each child innoculated against smallpox. In addition, the spectre of the King's illness, which first appeared in 1765, caused the Queen to be especially careful in attending to the childrens' health. Read what Mrs. Papendiek wrote about medical care in the royal household, or read more about the King's illness.
King George III in His Final Illness, after Charles Turner's engraving. In: Papendiek, Charlotte. Court and Private Life in the Time of Queen Charlotte. London, 1887. Frontispiece to v.1.
Sophia Charlotte in Her Later Years. Engraving. "Sophia Charlotte" published for European Magazine by J. Asperne.
Jeffress Collection, No. 7412, June 7, 1788. Manuscripts Division, Special
Collections Department, University of Virginia Library.
In her Letters and Diary, Fanny Burney d'Arblay described Queen Charlotte's visit to Bath in November and December, 1817.
Almost a year later, Burney writes in her Diary:
Tuesday, Nov. 17th.  -- This day, at one o'clock, breathed her last the inestimable Queen of England. Heaven rest and bless her soul! ...