ADHD, Aspergers, Learning Disabilities, Alcoholism is there a connection?

I have eight biological grandchildren. Two of the boys have been diagnoised with Aapergers, one boy has been diagnoised as ADHD and a granddaughter has been diagnoised with a non specified learning disability. There is also one grandson with Cystic Fibrosis. The family structure is My son has one son with Aspergers My oldest daughter as one son with Aspergers, a daughter with a non-specific learning disability and a son with cystic fibrosis My youngest daughter has a son who was recently diagnoised with ADHD Obesity, alcoholism, and depression have been part of the family challenges for at least four generations. Is there a connection between all of these conditions? If there is, is there anything we can do about it? Thank you