The Behaviour Book: A Manual for Ladies, 1853

According to Wikipedia, the real story behind Lady Erskine is much sadder:

In 1818 he married for the second time. His bride was a former apprentice bonnet-maker, Sarah Buck, with whom he had already had two children. The couple traveled to Gretna Green for the marriage, with an angry adult son in hot pursuit. It was a tempestuous relationship, and the marriage ended in separation a few years later. 
…
His widow survived him by over thirty years. She, as reports in the Times revealed, was reduced to poverty and had to rely on a small charitable allowance to survive. Even these meagre payments were withheld by Erskine’s executors when she tried to prevent them sending her son Hampden away to school, and she had to appeal to the lord mayor of London.