I don't think AM has Marfan's. I think, especially given his mother seems to be very troubled as well, he probably has adult fetal alcohol syndrome.
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Small head
-Low nasal bridge
-
Small eye openings
-Epicanthal folds
-Short nose
-Smooth philitrum
-
Underdeveloped jaw
...
-
Heart defects
Behavioral traits:
Lack of appropriate social behavior
Manipulative behavior
Places self and others in harms way
Likes to stir up chaos
No cause and effect thinking
Defiant
Failure in school
Poor eye contact
Low IQ
Hygiene issues
Poor memory
(More, but I snipped some that seemed most relevant)
As adults:
Lack of social skills
Inability to read body language
Inability to understand and obey the laws
Can’t take care of personal finances
Thrives in potentially dangerous situations
Inability to tell time on an analog watch
Unable to hold down a job
Sexually inappropriate behavior
Can’t follow directions
No resistance to peer pressure
“In your face” personality
Can’t learn to use public transportation
Likes living on the edge
Drug and alcohol abuse
Memory problems
Mental illness
Inability to focus
Forgets medications
Easily confused
Can’t live independently
Homelessness
Manipulative behavior
Lying and stealing
Victimization
Argumentative nature
http://kidstoadopt.org/adoption-resources/medical-conditions/about-fetal-alcohol-syndrome/