What should immediate family members wear to wedding if the wedding is BLACK and WHITE?

I don't think you need to announce it. Most (emphasis on most) people know not to wear white but black is a pretty standard wedding color especially for men with suits.

Why not ask them what they want to wear? There's no rule saying they HAVE to wear opposite colors or any specific colors at all. Our family is wearing whatever they want. My mom requested I make her a ribbon rose out of our wedding color so can "match" in some way, so I'm doing that for her.

EDIT: Dad will be wearing a tux to walk me down the aisle with a grey vest and tie. Mom decided she'd wear a grey dress to match him. Grey isn't one of our wedding colors, it's just how things worked out.

To be honest...I were LBDs to weddings all the time and I don't think I look like I'm going to a funeral. Like Koch said above, you can pretty much rest assured that nobody else will wear white to your wedding but I think you're just going to have to let it go in regards to the black. Its a very classic and elegant color that people wear a lot. If you are dead set on them wearing an opposite color, what about red dresses for the moms and red ties for the dads? It would be a nice pop of color

Parents are wearing our colours in our wedding and I've decided that IDGAF, and I'm not going to say a word to them... Red is like the second bridal colour for Asian culture, and all of the parents individually decided to wear red O_o But I haven't said anything to them, and I don't plan to.

You don't have a single accent color at all? Maybe choose one that they can wear that you think will look good in your pics. That's the only thing I think you need to consider and if you don't care what pics looks like, then let them wear whatever they want. Black doesn't necessarily mean funeral (especially if your BMs are wearing black) and no one in their right mind would wear white to your wedding.

Our colors are maroon and gold. Or BM's are in maroon and FH and the GM are in grey tuxes. The dads are wearing black tuxes (you could have them wear grey) and my mom and her wife are wearing navy. My step mom is wearing teal and FMIL is undecided. They don't have to be "opposite" they just have to complement. Your wedding is in the spring so some nice spring colors would be good. Also unless you are doing all white followers you will have to have something other than black and white for flowers, you might want to pick some accent color to incorporate and they could wear that too.

ETA: I didn't tell them to wear these colors. Its what they picked.

Thanks ladies.. . I just want the wedding pics to be nice and just having any colors would be tacky. But I have definitely thought about having Red involved. Good ideas

I am not telling my family what to wear. I think my brother would laugh at me if I tried to tell him to wear only certain colors. lol

I'd let them wear what they want.