In what field is or was the art of Ralph Steadman, Thomas Nast, James Gillray and Thomas Rowlandson usually expressed?

Question

British artist Sir James Thornhill (1675-1734), history painter and sergeant painter to George I and George II, was related by marriage to which other artist?

Answer 1

Cartoon
The artists are political and/or social satirists and caricaturists from the UK and the USA from the 18th to the 21st centuries.