okay this is just a theory but kate, jack,and hurley all seem to be following in their parents footsteps.
Jack's dad was a drunk, and in the future they show jack all drunk and crazy like his dad.
Also the whole reason that Kate was being chased down by cops was because she blew up her mom's abuseive husband. In the future when kate says "i got to go, he's probably wondering where i am." She could have married someone who is abusive to her,ergo following in her mom's footsteps.
Hurley i'm not completly sure about...but his dad was kinda crazy and hurley ends up in the mental institute. Also, on the island, he fixes up that van and his dad told him to have faith, which is what her was repeating in the van when trying to jumpstart it.
well these are my thinkings if you know anyone else on the show like them pleasssssse tell me!!!! thanks!