This is long, but:
DS recently received an Asperger's diagnosis, and in the massive reading I've been doing lately it's become glaringly obvious that my whole family is on the spectrum, at least one grandparent, my father, myself, and both siblings - one reason that it took us a while to even start pursuing a diagnosis with DS was because everything he did seemed so normal to us!
All except for DS are of generations where this was not diagnosed. Just as I would have a couple of years back, they might consider themselves a bit non-mainstream, but autistic would never cross their minds. And we've all held down jobs, though with probably a bit more chopping and changing of careers than would be considered the norm.
Grandfather - started off polishing floors. Later many, many niche jobs that didn't really involve contact with others, such as film projectionist and gemstone polisher.
Father - electrical engineer. His lack of social skills meant that he did not follow the usual promotional pattern - was stuck in the same position for 25 years, then got promoted in a precipitous manner, due to his unusual skills, to PA of the electricity company chairman and finished up as a regional director of the same company. Since he retired he's been running a radio station that broadcasts classical music (his obsession).
Brother 1: degrees in engineering and IT. Worked for various companies, often trouble-shooting other peoples' errors. Currently self employed and works from home in a job that uses both the degrees he studied for.
Brother 2: graphic designer. Worked for lots of different companies. Currently self employed and works from home. Makes pots of money. He would perhaps be the most 'autistic' rather than 'Asperger' in that he didn't speak at all until he was three. And it might be a comfort to you to know that it wasn't until his last year of school that it became apparent he had any particular talent or desire to work in any particular field.
Me: basic obsession started off as languages. Several of them. Started off as a high school teacher, but found the social interaction required very hard going (and remembering the names and faces of the students. Hopeless...). Went back to uni. Now have a PhD, but am self employed and work from home (sensing a pattern here?
translating technical material from Japanese).