Oh Beckey, that's wonderful! Thank you for including Christopher's employer. I hadn't (stupid me!) thought of using the Scottish census to find the family, Scottish research being unfamiliar territory for me. Christopher's birthplace raises some doubt about the story that the Services were employed by the Duke of Roxburghe down the generations!!
However, it's lovely to finally discover John's siblings. I now know why John's only son was called George Christopher Service. While hunting for Services on Family Search yesterday, I jotted down the details of a Christian Brown, parents John and Janet, christened in Ladykirk, Berwick. There are two christening dates, one of 16 Jun 1811, and one of 25 May 1811 but I suspect the earlier one might actually be the birth date mistranscribed as a christening. 1811 isn't far off the date of 1814 calculated from the census, and the birthplaces tally so it looks like a match!
John married Janet Lothian in Duns in 1868, and their eldest daughter was born there early the following year, but it may well be his parents had gone elsewhere or died, possibly? By 1874, John had settled over the Border in Hebburn, where the couple's two younger children were born.
