For the Harris family on the 1881 Cardiff census, the names of Abraham's siblings were...
Sara,
Solomon,
Emanuel,
Rebecca,
Harry/Henry?,
Rachel,
Abraham (was then 5 yrs, so born about 1875/6-ish)
David
I know that Abraham's father - Simon Harris - was a pillar of the Jewish community in South Wales & later moved to Newcastle were he died in 1902, hence their daughter was named Simona in memory of Abraham's father. We think Abraham's mother, Maria Harris nee Bloom then went to live in Ireland, probably Dublin, so we feel that Abraham did have some siblings in Dublin.
HG2