As I understand and have observed Asperger's is a spectrum condition. Not knowing how close you are with father and/or son, it might be premature to assume he'd be ideal for a programming job (or any other technical vocation). Though, regardless of where the son might be on the spectrum, his family has experienced how different he can be. It is safe to assume that father is concerned for his son's well-being, and likely based on ample experiences.
I am mentioning this for two reasons. I would, first of all, identify and confirm the father's underlying concern. Why will he sleep better at night if his son has a job? I would not be surprised if any financial worries are dwarfed by, for example, the fear of seeing his son alone and isolated. The father might see the job as a possible solution mitigation to his real concern. Since not having a job is a problem, but a fixable problem -as opposed to Asperger's(*)- it might be the only solution he sees to help his son.
Not all those diagnosed with Asperger's find a niche in technical work. One of my close friends became a photographer. He was diagnosed at an early age and has had a therapist helping him make sense of the world. Regardless, the main message is that photography is his thing, it is something he enjoys, can keep him busy and pays the bills. The fact that the photographer is exempt from several social rules and expectations surely benefits.
Though not immediately useful, perhaps it gives you some ideas.