Jack helps his mom search for Christian's will, Claire is named in it

Jack arrives at his mother's home (and his childhood home) to help her search for Christian's will. When Margo fixes herself a drink, we can see that familiar red label marking McCutcheon's whiskey sitting with other bottles.

Margo tells Jack that David was upset at Christian's funeral and Jack says that he didn't know. Margo points out that David is likely as scared of Jack as Jack was scared of Christian.

She then finds the will in an envelope on a book shelf. She opens and begins to read and then asks Jack if Christian ever mentioned Claire Littleton.

So what did Christian leave Claire in his will and will this lead to Jack and Claire crossing paths in the new timeline?

Jack puzzled by appendix scar, has son named David

We start out the episode "Lighthouse" with one of Lost's signature bad Photoshop jobs. This one features the Shephard family, Christian, Jack and Margo. Next to it is a photo of Jack and Christian at the hospital looking very happy together, which is the opposite of what we've usually seen when they are together.

Jack rushes into his apartment to change out of his scrubs, and while he's in the bathroom, he notices a scar from having his appendix removed. Jack's mother Margo calls and asks if there's an update on Christian's coffin. Jack says that Oceanic told him that the coffin may have been checked through Berlin, Germany. He then asks her when he had his appendix taken out. She says that it was when he was 7 or 8, but in the original timeline, Jack had his appendix taken out on the island by Juliet.

Jack rushes off to St. Mary's Academy where a young boy his sitting on the steps waiting. We learn that this is David, Jack's son. So this indicates a massive change in Jack's timeline. This shows that his timeline has been altered not only 15 years ago with the birth of David, but when he was a child if he had is appendix out. So what are the causes of these big differences?

Christian's memorial service, Claire's mom is alive, Jack finds out Claire is his sister

Jack speaks at Christian's memorial service. Kate, Aaron, Sayid, Nadia and Hurley are all there. The only member of the Oceanic 6 not in attendance is Sun. Jack's mom, Margo Shephard is also there.

The unexpected guest is Claire's mom, Carole Littleton who obviously woke up from her coma some time after the crash of 815. She approaches Jack after the service and tells him who she is and why she's there. Jack finally learns that Claire is his half sister and he becomes visibly distraught. Kate overhears the conversation and then is approached by Carole who tells her that she has a beautiful son, not realizing that she is seeing her own grandson.

What were the circumstances surrounding Carole waking up from her coma? Was it related to the island?

The Oceanic 6 reunited with their families

Here's the Oceanic 6 (Jack, Kate, Aaron, Sun, Sayid, Hurley) about to land at Kalaeloa Airport to be reunited with their families. Oceanic public relations representative Karen Decker lets them know that they're about to land and that they do not have to talk to the press if they don't want to. Jack says that they will talk to the press and they've all agreed to do so. When she leaves, he says, "we all know the story" and "if we get any question we don't want to answer or we can't answer, let's just keep our mouths shut."

When they land at the Coast Guard Air Station, Barbers Point Hurley's parents (Carmen and David Reyes), Jack's mom (Margo Shephard) and Sun's parents (Mr. and Mrs. Paik) are waiting for them. There's a lovely reunion and Hurley introduces his parents to Sayid. No one was waiting for Kate.

In the first show, you can see another person in the plane besides the six and Karen Decker. He/she appears to be a member of the Coast Guard. Why are the six comfortable talking about their cover story in front of this person?