Yes, JONESES is a Scrabble word!

Letter values in Scrabble US: J 8, O 1, N 1, E 1, S 1, E 1, S 1.

Is it a valid word?

JONESES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

United States labor leader (born in Ireland) who helped to found the Industrial Workers of the World (1830-1930)
United States railroad engineer who died trying to stop his train from crashing into another train; a friend wrote a famous ballad describing the incident (1864-1900)
United States golfer (1902-1971)
American naval commander in the American Revolution (1747-1792)
one of the first great English architects and a theater designer (1573-1652)
English phonetician (1881-1967)

Also: mother jones, mary harris jones, casey jones, john luther jones, bobby jones, robert tyre jones, john paul jones, inigo jones, daniel jones.