Something I read on Tumblr... So I was looking on Tumblr and saw this BRILLIANT explanation of the chance that Clive and Luke might be brothers!Something I read on Tumblr...2 days ago in Literature Templates More Like This
So at the moment in the Unwound Future when the Time-Machine exploded, Luke was 3 and Clive was 10-11 years old. Luke was probably at some Day Care or Babysitter's, while Clive was at school or a friend's house or something. Then the Time-Machine exploded and their parents died. So Luke got adopted by Clark and His Wife (I forgot her name... I think it's Brenda) while Clive got adopted by the old lady. Then when the Professor and Luke met Future Luke, Luke thought he looked familiar.
And that's also an explanation on why Clive and Luke look so similar.