I'm always amazed that people think they have a right to comment about personal issues.
I was watching my niece and nephew one day. My son was 4, daughter and niece were 3 and nephew was 18mos. All of the kids have similar coloring.
Some missionaries rang the doorbell. As I was trying to politely get rid of them, the curious kids all came, one or 2 at a time, to see who was there. The following conversation ensued:
MM: Just how many children are there?
Me: Four
MM: How old are they?
Me The boys are 4 and one and a half, the girls are 3.
MM: Are the girls twins?
Me. No
MM: How can they both be three?
Me: They're only 10 months apart.
MM: Well!!!!!!!!

Me: Gotta go now. As you can see I'm kinda busy.
I know I didn't have to give them even that much info, but I decided to have some fun with these nozy folks. I chuckled to myself knowing that they thought all of them were mine. Guess it's good that they weren't passing out flyers from Planned Parenthood.

I also had someone confront me when I took them to the grocery store with comments about my big family. I just smiled and replied that we were blessed.