Hi Peter,
The central problem is that there is no evidence of the presence of William Snr after conception in 1892 in NSW.
The photo of Margaret and 5 children does not include William and was produced by Sibert the travelling photographer. He was in lithgow in 1891-92.
The photo shows 3 boys the youngest is about 2 or 3.
So that suggests the children are Peter, Andrew, James, Elizabeth and Isabella.There is no baby Samuel.
William Snr is clearly absent from the marriage of his first child Mary in 1894, as Margaret gave her permission for the marriage. Unusual if William was around.
Even the style of the registration of the birth is odd with the listing of Margaret as "Maggie"
This is more the style of younger person or a sibling and is not found in the birth certs of any other of his children .I suggest it may have been done by William jnr. He could inform the fact of the birth and legally sign as William Henderson.
So far no death has been found for him in NSW.
I am not suggesting the Nelson death is the final solution but it is the best lead we have at the moment.
Conversely, if it is him and we ignore it we will never find William.
cheers,
