C’mon now, it’s not like you’re Typhoid Mary or Mrs. O’Leary’s cow, eh? You’re human and you didn’t ask for your genes any more than the rest of us.
Of course, as a mother you will always feel guilty about something (it comes with the job, as I understand it) but you’re no more responsible for T1 genes then you are for your eye color or the length of your pinky finger.
Hang in there and hugs to you and your whole family.