Andy's dad was confirmed to be dead by the first movie, having given his old Woody doll to his son as a last gift, which is why Woody was so important to Andy.
i would love the theory on Ellie and carol from up but in the movie up when it shows us the life they've spend together there is a scene where she's in the hospital crying either she lost her baby or she can't get pregnant it's most likely the second one but maybe they are related in some other way like maybe she's her aunt or something like that
