Levaquin and peter d adamo

I mentioned this a few weeks ago and have found the source of my comments. It is in Peter D'Adamo's book "Eat Right For Your Blood Type". The reason I found this interesting is because my dad had a terrible reaction to Levaquin and was curious about his blood type after reading that AB and B blood types should avoid fluoroquinolones. Dad passed away in March, but ascertained his blood type from mom's, mine, and brother. I am O, brother AB, and mom type A. Dad, therefore had to be B. Food for thought.
Dad had ulnar nerve damage, loss of appetite, shortness of breath, insomnia, pain in calves and shoulders,etc. Succumbed suddenly from rare b-cell lymphoma in lungs, which just appeared out of nowhere while in hospital for Levaquin reaction. Mom unfortunately took Levaquin last month. Then suddenly is now dying from Anaplastic Thyroid Cancer. Is this all a coincidence? Is this stuff fertilizer for cancer?

Anyone aware that the book "Eat Right for Your Type" (Peter D'Adamo)mentions that certain blood types should avoid fluoroquinolone antibiotics? My dad had type B or AB, not sure, and suffered severe side effects to Levaquin. I am sure that these are the types that must avoid these drugs.