My husband will read my short stories, but I always use him as the final final final critiquer on them because I know he will only read them once. The problem is, he really hates reading. But he does like my short stories and always offers great advice on them. So I am now working on a novel, and I know he won't be reading it because it is simply too long (I don't know what turned him against books so much, but man it is a shame since he has such a great eye when he actually does read!). He does let me bounce ideas off him when I get stuck and stuff, and is very supportive of my writing. Heck, he went to FenCon with me and sat in on a bunch of panels just so he could learn more about what I had gotten myself into and be able to help out more with advice.
My mother-in-law has also read some of my stories, but only the ones that have been accepted somewhere for publication. When she reads them, they obviously aren't her kind of story at all, but she still asks for the next one sold to read because she is that kind of cool. And she will read it.
As for my mother, I have stopped telling her when my stories are accepted because she never seems to hear me (or see, rather, since we usually IM each other). I even gave her the link to my one story online, and she promised she would read that, but I think she forgot. Sooooo, yeah. I love my mom, but I understand she isn't the type to be supportive or even aware of this career jump.
Outside of that, I have some friends I have given a few short stories to for critiquing, and it has gone well, but I don't hand over any of my stories for critiquing until I have fixed almost everything I can think of in them (usually 4th to 5th drafts or so).
There is a chance next week I will be showing part of my WIP, first draft horror and all, to a new local crit group another guy and I are trying to set up. That actually is a bit scary. Heh. But I would only be doing it because it doesn't feel quite fair to jump in and critique people without them having an idea of where my writing is coming from.
Sooo, Darklock, whether you show your wife (and any other friends and family) your WIP now depends on what you know about her and yourself. Will her comments derail you from finishing this draft because you want to go back and change what she has read? Will she read it once and once only so you'd rather save her to be a final reader? Can you handle it if she reads it and simply isn't excited, or will that cause you to throw the whole thing aside? Do you have certain expectations from her when she reads it that she is unaware of?
We can all give plenty of examples regarding our own families, great and terrible, but this decision must be based on what you know of your own.
-Michelle