Emma Treavis' death (Badcock, Seaby) and a marriage for her daughter

My great-great grandmother Emma BADCOCK married William SEABY in 1854. After her husband's death in 1872, she married for a second time. Husband no.2 was Jonathan TREAVIS, and they married in 1879. Emma was made a widow for the second time in 1897, outliving Jonathan by nearly 20 years and dying in 1913.

A newly arrived death certificate for her shows that she died on 31 October 1913 in Dry Drayton, Cambridgeshire, where she had lived for most of her life. Her age is given as 81 years, although the censuses and a possible baptism record for 1834 suggest she might have been a couple of years younger (79). She is described as the Widow of Jonathan TREAVIS, Farm Labourer, and died of Senile Decay and Cardiac Failure. Her daughter M STONEBRIDGE registered the death on 3rd November 1913.

At first this M STONEBRIDGE was a bit of a puzzle. Emma and William had four daughters between 1861 and 1869: Lavinia (my great-grandmother), Phyllis, Lucy and Margaret Jane. Margaret Jane SEABY had caused puzzlement of her own by apparently marrying her uncle William BADCOCK in 1887. FreeBMD has another marriage record for the Chesterton (Cambridgeshire) district in 1904 for a Margaret Jane SEABY and an Albert Edward STONEBRIDGE.  I have found an Albert E on the 1891 census living with his parents, working as a farm labourer and aged 25. They are living in Girton, Cambridgeshire.  They are still in Girton ten years later, and Albert (called Edward) is aged 36, an agricultural labourer, and still single.  By 1913, Margaret STONEBRIDGE is living at Edinburgh Farm, Dry Drayton, presumably with Albert Edward. I haven't found a likely death record for him.