Have you found any of the the family in 1911? I've drawn a complete blank.
Passenger lists show an E O Williams, merchant + Mrs Williams, Master Williams and Miss Williams sailing for Buenos Aires and contracted to land Pernambuco. Both children are under 12 but the absence of given names/initials for E.O Williams's fellow travellers rules out linking with "your" Edward Owen - so, so frustrating.
So, Brazil, here I come.
PS - I haven't ruled out Edward dying post 1912.