Relaciones
Hijos
- Karl-Jean Longuet (1904–1981)
Medios hermanos
- Eleanor Marx (1855–1898)
- Jenny Longuet (1844–1883)
- Laura Marx (1845–1911)
- Edgar Marx (1847–1855)
- Frederick Demuth (1851–1929)
- Heinrich Edward Guy Marx (1849–1850)
- Jenny Evelin Francis Marx (1851–1852)
- Karl Liebknecht (1871–1919)
- NN Marx (1857–1857)
Padres
- Karl Marx (1818–1883)