I know quite a few of you research your family history, as I do. We all come across impenetrable brick walls from time to time. Hoping you might have some suggestions for research strategies for this one! I've been on the trail of my great-grandfather for ten years. My great-grandmother was already married to a mariner with 9 children, living in the very poorest part of Greenwich, on the wharves. She then separated from him and moved to Camberwell, where she had two babies (one of whom was my grandmother) with a new man. (Other men and babies followed this relationship - but let's not go there!) I have found the family of this man living across the road from her in Greenwich. The father of the family and two of his brothers were watermen, members of the Guild of Watermen and Lightermen. Presumptive great-grandfather's occupation is given as 'seaman on board a steam tug' and 'waterman' on the birth certificates, though there is no record of him having don an apprenticeship as a waterman like his father and brothers. He is on the Census until 1871 and then disappears completely into the ether. Nothing on any later Census; no death or burial recorded; no prison / workhouse entries; nothing obvious on any ships' manifests for either passenger or crew; nothing in the newspapers. The two babies' birth certificates contain falsified information - great-grandmother uses the father's surname as her own, lies about her maiden name and states she is married (true - but not to him!) so he need not have been present at the birth registrations. Any bright ideas about where to look for this man next?