2 of my kids are adopted but look like me. Should I correct people who assume they are biologically mine?

I have 3 young kids. My oldest turned 3 last month, my middle is 21 months, and my youngest is 3 months. I have blonde hair and blue eyes. By pure coincidence my sons, the 3 year old and 21 month old, both due as well. I say by coincidence because they are both adopted. They don't have the same birth family. My youngest is the only biological one and she also has blue eyes and the little bit of hair she has is blonde.I am a stay at home mom. When I take the kids out shopping or to the library or park sometimes people will say that all of the kids have my eyes or the middle has my nose. Sometimes they'll say that the boys look a lot alike or will say the baby looks like one more than the other. I usually just smile, thank them, and don't take it any further but should I be? I don't want my kids to think their adoptions are shameful or something to keep hidden but I don't want to share their stories with every stranger. It never ends at just saying they are adopted. Then the person wants to know if the boys are related or what happened to their birth moms or if our autism runs in the middle's family since he was recently diagnosed as being on the spectrum. It leads to a bunch of questions and can make things awkward for everyone.Today someone asked their ages and when I answered her she said, "You had a kid every year? Props to you mama!" I thanked her but I only gave birth to one of the kids. Should I have said something? Talked about it with my kids later? I talk to them about their adoptions but don't want them to feel like they have to hide it or feel like I am rejecting their birth parents. I don't know what to do or how to handle this. via /r/Parenting https://ift.tt/38YcC2S