Regarding Ellen Maria's siblings, the BDM records have Frederick born to John and Louise Isabella Keating in 1876 (the 8 yo on Isabella's death cert?) and Isabella Jessie born to John and Isabella Keating in 1881 (the 2 yo on Isabella's death cert?). I have now also found a news clipping from 1895 about John Joseph 'second son of John Keating of Napier' getting married (paperspast, Hawkes Bay Herald) - if he was the 14yo on Isabella's death cert then he would have been 25 getting married, which makes sense. So we need to look for 2 more boys - the 16 yo and the 6 yo on Isabella's death cert
I also found news clippings in the Hawkes Bay Herald for the following:
John Keating forfeiting bail for drunkenness (7/10/1878)
John Keating a sheep farmer of Mohaka filing for bankruptcy (14/10/1879), the estate of John Keating auctioning horses and dogs (several days in a row to 7/11/1879), and discharge of his bankruptcy granted (6/8/1880).
John Keating of Shakespeare Road offering for let a 4 room house on Coote Road Napier, and John Keating demanding that John Bullock remove the dog he has left at his house (several days in a row, 18/11/1884)
John Keating gives evidence in an unrelated court case (sensational divorce case, a good read!) saying that he has been in the employ of a Mr Joshua since 1890 (28/10/1892) but it’s not clear what Mr Joshua employs him to do, maybe John works at the Spa owned by Mr Joshua? And John Keating cabdriver gave evidence at another unrelated trial (12/5/1899)
John Keating cabdriver being bound over to keep the peace after a quarrel at the railway station (4/2/1896). John Keating being found guilty of using offensive language (4/8/1896). John Keating, a local cabman, being charged with refusing to take a passenger (4/4/1897). John Keating was fined for driving a vehicle around a corner at other than a walking pace (11/12/1900)