by Graeme Simsion. It's the third in a series and it's a hoot.
The narrator is one Don Tillson, who is clearly an Aspie, but doesn't fully realize it. In the first book, the Rosie Project, he decides it's time to find a wife (the Wife Project), and because of his Asperger's, things go amusingly wrong. The second, The Rosie Effect is about the beginning of his marriage to Rosie. This one is some ten or so years later, and it's quite obvious that Don and Rosie's son Hudson is likewise an Aspie. Don decides to deal with his son's school and social issues. It's a hoot.
My descriptions are boring and incomplete. Do read the books. Especially the first and third.
Simsion's book The Best of Adam Sharp is so completely different from the other three that you must read it as if it were written by someone else entirely. But it's very good. It's just that after the Rosie ones, your expectations will simply not match this book. But I recommend it.
I see that Simsion has one more novel, co-written with his wife, Two Steps Forward. My library has it so I think I'll go get it.