Great Old One:
I was also thinking a bodyguard doesn't really fit. Yates is in his forties and of the same social class as you. How about he is an old family friend who also spent a lot of time with Jonathan when he was younger, teaching him his love of the outdoors and skills such as riding and shooting.
He does feel a strong sense of duty towards you, as he was close to your mother, so was happy to come along at his own expense to keep an eye on you.
Works for both of you?
I agree that Bodyguard may seem a little crude, but there is definately a need for security.
Yates is a man of independant means, an retired Army officer, well placed in Boston society, and a personal friend of the Cavendish family.
George Yates has been mentoring Jonathan in the gentlemanly pursuits of hunting with horse and hounds, and shooting etc.
You can think of George as un
uncle, but no actual relation. George is all too aware of the hazards of life,
and as Jonathan has hardly left New England his whole life, but there certainly is a need to have trusted people around you.
Perhaps George can be the Boston Huntsmaster? Crimson jacket and all? Hunting with horse and hounds is still fashionable right?