I have found 8 separate trees claiming my great grandfather as " theirs" . Trouble is, he is in Lancashire and they are in Yorkshire. Whilst it is not impossible he could have been dashing back and forth and have two families, I really doubt it , the transport links between the two were very difficult in the 1850's ( and even now!)
I contacted the tree owners to ask why they thought he was their relative, only one replied and has now realised he is only a century out on his dates.....