The portfolio of drawings by the Bradford-born painter comes by descent from his daughter Rachel Ward (née Rothenstein).
Her grandfather Moritz Rothenstein is pictured in a pencil drawing signed and dated 1914 (estimate £100-200) while she herself is the subject of at least two drawings: a sketch of two young girls (estimate £200-400) and the later bust portrait in coloured chalks inscribed For Mrs Ward and dated 1921 (estimate £200-300).
Other sensitively observed portrait drawings may also depict family members.
The works date from the period after 1912 when Sir William and his family had settled into a Cotswolds rural idyll at Iles Farm in Far Oakridge, near Stroud. Arts & Crafts architect Norman Jewson was engaged to restore the rundown property and local craftsmen were commissioned to enhance its contents.
Other items from the family collection include a walnut writing desk with a distinctive ‘hayfork’ stretcher, attributed to Peter Waals, estimated at £2000-4000.