I am a decendant of Ruby Florence Whatmore (b.1844), who is the sister of Violet Whatmore. I'm afraid I don't know any more about Thomas Hudson or his wife than you do. All I know is that Emily Hudson had a sister called Mary Jane.
On the other side I know of Alferd Ernest Whatmore (husband of Emily Hudson), his parents Thomas Whatmore and Sarah Stephens, and Thomas Whatmore's mother Sarah Whatmore. The information for Thomas Whatmore says he was lease born and his marriage certificate shows father as Philip Tibble. Do you know what this means and do you have any further information on either branch of the family.
I would also be interested to know anything about why Alfred Ernest Whatmore was in Sri Lanka. Was he in the army?
I would be very grateful for any information you have.