Associated with Edmund Resch Snr in his business were his two sons Edmund Jr (born 1880) and Arnold Gottfried (born 1881). They were educated at the Sydney Church of England Grammar School (Shore School) in North Sydney and Scotch College, Melbourne. Edmund Resch Jr married Florence Mabel Bennett in 1927 and they made Swifts their home until they died (Florence in 1959 and Edmund Resch Jr in 1963).
In September 1925 Arnold Resch, who regularly appeared in the social pages of Sydney's newspapers, was the defendant in a sensational £25,000 "Breach of Promise" legal action against him by Madame Andre Vacher Lauzanne, a so-called French beauty who was the proprietor of "an exclusive Sydney salon". This was a highly publicised legal case resulting from the alleged failure to proceed with the matrimonial plans. It was reported that the case "was a cause celebre that rocked Sydney and sent the circulations of the evening press soaring to record heights for several weeks". The salaciousness of the Lauzanne vs Resch case and the notoriety of the defendant became the subject of a black and white short film which was a huge hit in cinemas. Following settlement of the Supreme Court of New South Wales legal action, in February 1926 Arnold Resch (then 46 years old) married 21-year-old Tottie (née Dennis) in a private ("doors locked") service at St Marks Church, Darling Point, which was followed by a reception at the Astor apartments in Macquarie Street. He subsequently purchased the property of Belhaven in Victoria Road Bellevue Hill.
In 1929, the Resch brewery was acquired by Tooth & Co Ltd with the issue of £1,250,000 shares to Edmund Resch Jr and Arnold Resch. The Reschs’ gave their 500 former employees a gift of £30,000 to be split amongst them, which was very well received.
In August 1929, an unknown assailant (believed to have been a disgruntled Resch's employee opposing the brewery merger) set off dynamite at part of the wall surrounding Swifts. The incident attracted widespread press attention, with the Daily Telegraph reporting it as an "Attempt to Blow Up Darling Point Home – Terrific Explosion Tears Hole in Wall Round Edmund Resch's Mansion".
On Carolina's death at Swifts in 1927, the Resch family brewing empire in New South Wales quickly unravelled as the two sons disagreed over the future direction of the company and of Swifts. Swifts was placed on the market in 1928 owing to the family dispute.
In February, the brothers appeared in the Supreme Court of New South Wales, before Chief Justice Harvey, to divide their father's estate and to determine the future ownership of Swifts.
In October the "Grand Old Resch Home" was sold at public auction to Edmund Resch Jr. Arnold Resch transferred his undivided moiety in Swifts to Edmund Resch Jr.
Arnold Resch retired from the brewery business in 1930. Due to his concerns about the high rate of taxation in New South Wales, on 11 March 1936 Arnold Resch farewelled Australia (aboard the new Orient steam liner the Orion) for Jersey in the Channel Islands together with his wife, Tottie Resch and daughter Vera Caroline (later Le Cras).
Following the German occupation of the Channel Islands from 30 June 1940, although an Australian citizen Arnold Resch was removed from his family and the Jersey home that he had acquired, being a grand chateau on 22 acres with orchard and gardens and was repatriated to Germany where it is believed he died in 1942.
In August 1935 Edmund Resch Jr undertook alterations to improve the living and working conditions of his staff and repair the wall. He commissioned plans by architects Robertson & Marks for new laundries and the gardener's compound. In addition, concrete was placed over the carriage drive and garden paths. The changes made for the servants from the original Tooth-era structures reveal the general employment circumstances of domestic staff in the inter-war era with their diminishing numbers limiting employers' opportunities for engaging and retaining reliable staff. Edmund Resch Jr also redecorated the interiors of the main house in the late 1920s, with much of the heavy flock wallpaper still in situ by the 1990s. Further plans were prepared by architects Robertson & Marks for the retaining wall, lavatory, and manure bins. During this period the house continued to feature prominently in pop culture with Women's Weekly running the occasional article of the intimate jottings of tennis parties and balls at the "castle-like home of Mrs Edmund Resch, Darling Point".