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This year is my first vegan Thanksgiving and my aunt, whose house I'm going to for the meal, is sort of put-off by it, I can tell. But, her sides are always amazing and delicious, and I am going to bring some mushroom gravy and maybe some Field Roast for my main dish. She makes an incredible apple pie - made with vegetable shortening and Earth Balance margarine - that is the best I have ever tasted, and I'm not a pie person so that's a saying something.

I'm going to have to agree with other comments that sides and pie are enough for me! 101cookbooks has a great olive oil mashed potato recipe with kale that could be vegan but still omni-friendly.

@nitsuj If I eat meat/chicken stock/etc. I get sick. I don't think it's polite of me to ruin Thanksgiving by getting violently ill just to avoid putting them out and having my host make a different recipe when they are already cooking and have invited me over to eat. Often I will bring a dish, suggest a recipe so they don't have to find one, or offer to cook. Would you think a Jewish guest should eat bacon because they are inconveniencing you by voluntarily keeping kosher?

I am a vegetarian and I was born on a Thanksgiving Day so this is a BIG DEAL for me... I just don't like to eat a bunch of side dishes that seem to have nothing in common... That's why I have taken it upon myself to make a vegetarian menu with which noboby will miss the traditional turkey. This is what I have done in the last few years:

2006
Butternut Squash Lasagna from Giada Di Laurentiis
I guess we accompanied it with a salad... can't remember

2007
Butternut Squash Mac & Cheese
Vanilla Maple Glazed Carrots
Sweet Potato Flan
Arugula/Red Onion Salad

2008
Pumpkin Rissoto
Baked Sweet Plantains
Vanilla Cheese Flan - same recipe as above, but without the sweet potato added.

2009 - this menu is still in the works... but here are a few options I am considering
pumpkin polenta
sweet potato mash with a homemade cranberry sauce
truffle mac & cheese - just because its delicious and super simple to make
roasted pears with blue cheese and hazelnut pralines

I've always gone the sides route and have been vegetarian long enough that my family respects my decision and doesn't make the sides with chicken broth or whatever. It also helps that many of our family's traditional dishes don't have animal products, like my grandmother's roasted eggplant salad.

But, if there's any worry that you're putting someone out with your request (or that you're being put out), there's no harm in bringing something to the table yourself (or asking your guest to). It lets the vegetarian be in control of their food, introduces other family members to their lifestyle choice/veggie foods and helps the host/hostess out. Honestly, most veg*ans are used to this anyway and it'll be a good experience for your brother.

Since my grandmother is getting on in years, I plan on doing a lot of cooking this year anyway. I'll be making a veggie gravy (roux of margarine/flour, veggie broth, various herbs and soy sauce for umami), green bean casserole, garlic mashed potatoes and sweet potatoes from The Modern Vegetarian Table. My husband, an omnivore, is making his signature "bird in a bag" (roasting a spice-rubbed turkey in a paper bag).

@Nickiter

Like not be a difficult eater for a day and just deal with what's given them?

One-eyed Jack

i've been making these zucchini muffins for breakfast all summer long: http://find.myrecipes.com/recipes/recipefinder.dyn?action=displayRecipe&recipe_id=249591

they freeze really well - in the morning when i'm leaving for work i just grab one from the freezer, put it in tupperware, and take it to work; about 3 hours later when i'm ready for breakfast it's thawed and still moist.

My hubby made these for me for me all the time when we were in college - we call them Eggs in a Basket.

Eggy in a basket, from V for Vendetta.

Everyone knows it's called a "bunny egg". My grandmother invented it.

Growing up Dad called it a Bulls Eye (from Rhode Island). We always loved when Dad had to make breakfast! He cut the hole with a shot glass so the hole was just big enough for the yolk part and the rest of the egg ran over the bread so you had to flip it and cook that side too! Just don't over cook it and it won't be dry. The hardest part was buttering both sides of the bread. I get around that now by using a brush and softened butter.

Radio eggs!