The probate details naming Mary Ann as the beneficiary are on Family Search website as is the 1901 census for Emerson and also the Find a Grave link.
Ancestry gives a few more details that Emerson was residing at 64 Bedford Street in 1909 and that he left to Mary Ann his widow 570 bps 6s 8d.
I am sorry John, I have been trying to find the record for Emmerson's accident which claimed his life. I was sure it was on Family Search but I have failed to find it again for you. If I stumble across it again I will let you know.
Thank you Wendy, I might have to take a gamble and send for the birth certificate to see if this is the missing child but shall have to wait for next pay day!!!!!!!!