The following advertisement appeared in the Isle of Man Weekly Times on 23 Jul 1892

The North-End Music Stores (Nems) had been established as a piano and organ importers in 1886 and run from 70 & 72 Walton Road, as shown above.* It would eventually be purchased by the Epstein family, which had originally taken over a furniture store at the neighbouring 80 Walton Road around 1900-1901, which in turn had been run by Nicholas Frudenstein (or Freudenstein) from 1892 until 1900. Frudenstein's wife, Annie, who was a broker, had advertised in the Liverpool Mercury for used clothing, such as in this advert of 6 Nov 1897:

Annie was still listed as living at 80 Walton Road in the 1900 Gore's Directory, which shows Isaac Epstein as living at 16 Langsdale Street East and working as a draper, as shown below:

In the same year, he married Dinah Hyman from Manchester, whose Polish Jewish father had also been a draper. It is plausible to infer that they moved into 80 Walton Road upon marrying.
By 1938, when Brian was 4, his family ran stores at several Walton Road addresses, and also at 27 Anfield Road, as shown in this page from Kelly's Directory of that year:

Acknowledgement: I am grateful to Philip Kirkland for initiating research into this topic with his own findings on the Frudensteins, upon which I have built in dialogue with him.
*Frank Lott was the organist at St Saviour's Church on Huskisson Street/Falkner Square. Turner & Co. was owned by James Crook Turner, spouse of Mary. James was born in 1851 and listed in the 1881 census as a music salesman living at 16 Candia Street. He became a freemason in 1889. His wife Mary was born in Scotland as Mary Jane Copland and baptised on 23 November 1853. Mary died in 1906.