I don't think Karl is Ben's Son, for the simple reason that if he told Alex and Karl then Alex wouldn't get pregnant, which is probably Ben's major fear.
I do think that Karl's Parents are something to do with the plot though as it seems the writers have hidden his arrival and parents from us. Now Karl seems to have died I think we may get a few answers.
OOOh maybe he is Annie's(but not Ben's) Son. This could be why Ben appears to hate him, as he killed Annie, like Ben's Dad said he killed his Mum. Also a reminder that Annie didn't love Ben quite as much as we originally thought!!
I hope Karl gets some sort of flashback before he breathes his last breath.
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