Nick (Gus & Mike), When Mike replied with the 1908 marriage, I thought you must have made an error in your posting. But I've just been able to see the census image. The strange thing is that Augusta is shown as born in Stratford on Avon, whereas Martha, her supposed sister, is born in Beoley, and all other siblings in Northfield. I've seen the term "sister in law" frequently mis-applied. We now take it to mean husband or wife's sister, but in times gone by, it really meant "sister at law" or step-sister. I wonder if this might be the case? I'm also thinking they may not have been married and only tied the knot in 1908 as Mike found. I see there was a daughter Amy aged 3 in 1891 census. It may be worthwhile obtaining her birth certificate to see if Christopher is listed as the father. But to determine the exact relationship of Martha, Nick will have to go back and trace both Christopher and Augusta in 1881 and 1871 census and see who the resided with. It could be that Christopher had married a sister of Martha who has since died (perhaps giving birth to Amy). You'd need to check all possible scenarios. Peter in Sydney