Who cares what anyone might think? The fact that ZPGZealot posts here should tell you that what people think has nothing to do with you. So very many children are adopted nowadays, and of different ethnicities. No one thinks much of it anymore (except for ZPGZ). Of my 2 adopted kids, one looks like she could be our bio-kid, and the other one, not at all. No one ever says a word.
I don’t. And I don’t base anything on ZPGZealot.
Perhaps I phrased that poorly…I was just rambling.
Got it. Occasionally, someone might say something to me regarding my dissimilar kids and I’ll just say, “Oh, they have different fathers. Don’t tell my husband.”
I ended up doing this too, for my brothers who were 10 and 11 years younger than me. Put me right off having kids it did! 
But I only did it for eight years, until I turned 18 and left home.
Nice.
My friends adopted one child from Guatemala(when that was available) and had their other child biologically.
Anyway, she was at the store with her kids and they cashier looked at the two kids and whispered, “Hey, different fathers?”
It was awkward, according to her.
She should’ve answered: “No, different mothers.” 
I have an adoptive Korean son and a white bio daughter that are very close in age.
Yes, he was adopted when we thought we couldn’t conceive.
Yes, sometimes people say dumb things.
They almost never say dumb things now that the kids are older, and my kids have no memory of the dumb things they said back then. And now when people say dumb things, my kids are old enough to understand the answer - which is often “gee, that’s a very personal question. Why do you ask?”
We get the “it always happens that way.” To which I usually answer “I know you mean well, but you are wrong and that statement is almost never taken well by adoptive or infertile people.” Although sometimes I answer “no it doesn’t, but we feel very fortunate that we ended up with both our wonderful children.”
Wow, that’s *incredibly *awkward. For the cashier.
I hope your friend was kind enough to minimize the cashier’s embarrassment at having blurted out something rude like that by politely pretending that she didn’t even hear it.
But the thing is, people are going to find something stupid to say, regardless of what your kids look like, so don’t sweat it. Me, I’m going to have a baby soon that will probably look nothing like me. Anyone who doesn’t know my husband will assume it’s adopted, and some of them will comment on that. I’ll answer (or not) however is appropriate at the time, probably along the lines of Dangerosa’s suggestions. And baby will learn the valuable lesson that although people can be idiots, it often doesn’t matter.
I don’t think she could come up with a witty response, so she just ignored it or said, “no” or something.
Basically, “different” seems to break down people’s ability to hold back awkward questions.
Especially stupid people.
Yep, I have a bio-child and step child. Well, sort of a step-child. She was 18 months old when I met her, and raised her ever since, for the most part. Her biological dad never visited or called or gave any sort of assistance at all, and I was fine with that. When the divorce happened she hated me for a long time. She was disrespectful and rude and 13 at the time. Her biological dad actually took her in when her mother ran into financial troubles, but he got tired of her after 2 months and now she lives with me, along with my son full time. She doesn’t hate me any more, thankfully. It’s almost back to the way it was before, but she doesn’t call me dad any more. Actually, she doesn’t call me anything.
I regret never formally adopting her. I guess I’m a guardian now. That word is cool. Guardian. I feel like I should have a huge golden shield and a shiny broadsword.
I know a couple where the wife is Chinese and the husband is Caucasian. Neither (biological) child looks a thing like either of them, and they are asked questions about it, too. And I have another friend who is Filipina and her husband is Caucasian with brown hair, and one of their (biological) kids has pale pink skin and light red hair.
I’ve heard people not wanting to adopt unless the children looked so much like them that no one would be able to tell that they weren’t their bio-kids. I think they should just get a pet, instead.
It might make the job go easier sometimes.