Upon his death, it was discovered that Cruikshank had fathered 11 illegitimate children with a mistress named Adelaide Attree, his former servant, who lived close to where he lived with his wife.
La moartea lui, s-a descoperit că Cruikshank era tatăl a 11 copii nelegitimi cu o amantă pe nume Adelaide Attree, fosta lui servitoare, care a trăit aproape de locul unde a locuit împreună cu soția sa.