User blog comment:FairyRaven/Fairy Tail Chapter 327: My Part Too, Review and Commentary/@comment-5444132-20130412183641/@comment-4829046-20130413120902

Lucy's parents? R u serious? They both died in the current century. I was referring to the DS. And if they are indeed 400 years old(as speculated), then that would mean their parents existed 400 years ago. Make sense no?

Oh and on the note of time-paradox, if you guys say Zeref remembers Natsu when Natsu went through time and met in the past, here's a little something that contradicts time-paradoxes, F-Lucy didn't remember ever meeting her future self in the past(ouch my brain hurts from writing that) or that both Lucy's met F-Rogue, in other words, so far time travel hasn't caused any changes n space-time in reference to people's memories.