If the virus attacks a cat's brain, for example, a seizure may present itself as a symptom. Like FIV, the feline leukemia virus (FeLV) affects a cat's immune system. FeLV can cause secondary infections or even cancer in a cat. One of the symptoms of this virus is a neurological disorder, like seizures.
Lilo is a young girl living on the island of Kauai with her older sister, Nani. On a rainy night, Lilo and Nani's parents were killed in a car accident, leaving the two sisters orphaned. With Nani being of age by the time of the tragedy, she was dubbed Lilo's legal guardian.
Basically, the theory is that Lilo and Nani's parents were actually in the CIA and Cobra Bubbles (shown above) was a close friend and coworker, and he promised to look after the kids upon the passing of Lilo's mom and dad.