Hi - if John Augustus Shadwell was a forefather of yours, then you are possibly a very remote cousin of mine.
The mother/s of the three children is just listed as being 'native', no name or names (British Library India Office records).
Jane Shadwell married Earle (I once had email contact with an Earle researcher, but he had no information on Jane Shadwell other than the fact of the marriage and children).
John Bird Shadwell married Emma Brockway (she and her sister went out to India, where she met him).
Henry Shipp Shadwell
John Bird Shadwell and Emma had half a dozen children, born in Cherrapunji (one or two in Shillong maybe). John Bird Shadwell was stationed at Cherrapunji, where he was a 'reader', and he wrote about the hill people's languages and customs I believe (I wonder whether this work survives somewhere).
Emma eventually died of fever when they were out and about round the hill villages, so she is not buried at Cherrapunji, though there is a plaque to her there. They lived at Emma Villa, and John Bird Shadwell is buried there in what is now the Langstieh family graveyard.
John Bird Shadwell remarried a while later. Emma Villa should have continued in the ownership of the women of the second marriage family, as with the matrilinial property inheritance tradition, but it was sold to the Catholic church, I believe.
The first three of John Bird and Emma's children were sent to the UK to live with Emma's sisters, and the three younger ones followed later, after Emma's death, so all were brought up in the UK.
I have not managed to track John Augustus Shadwell's line back any further. All I know is that my mother was told that he was over-fond of alcohol. Not very helpful. I would guess from the middle names of his children that he was friends with a Bird family and a Shipp family in India.