Context: Needless to say , I found a ride and went home . On the way home , my cellphone rang , and luckily I answered it even though it was a number I did n't recognize . It was someone calling to tell me that my mom was in the hospital with ( I ca n't remember , but it was the same thing grandma had ) a deadly disease and was n't expected to make it through the night . I just remember being so numb with shock , so confused , and the voice on the other end of the line sounded so ho - hum .

Question: What may be the reason why their mom has the same thing their grandmother had ?
Options:
0. Because she is n't taking her medicine .
1. Because she did n't get a vaccine .
2. Because she 's not taking care of herself .
3. Because it 's genetic .
Answer: 3