Originally Posted by The Chocobo Warrior
So...Did Tidus's mom quit loving him when she died or something? Because you would think she'd still have a strong bond to the guy.
Tidus' mother went to the Farplane because she accepted death, and Auron tells you in one of Tidus' flashbacks the story about the lovebirds, where if one dies the other will die too because they cannot bear to go on living without them. So when Jecht went to Spira and was presumed dead, Tidus' mother decided to go join him (not in Spira, but on the Farplane, as this is where she thought he had gone). She didn't really have a reason to stay with Tidus as before she departed she entrusted Auron with his safety.