I have one sister with three kids. The two oldest are boys then a girl. (Shop closed.) My sister-in-law has two boys. Our son, Samuel, is the youngest of five cousins.
When Sam was about 6, he looked up at me in the kitchen one day and asked if he was going to have any brothers or sisters. Just enquiring, curious, probably wondering how it works; why some kids have only one brother, others have a brother and a sister.
I looked down at him calmly, deep in the eyes and said: "You know, some parents will keep having kids until they get one they like... and we like you."
That was it.
He said: "Ok!" and got back to playing; his curiosity answered. It was like he was wondering what the next card in the deck was and once it was revealed, he could get back to playing his hand.
Many parents have told me how smart that was as I've retold that same story. One lady glared at me with wide eyes and mouth open. She looked at her husband with the same deep look that rewound memories of three kids. You could hear the gears in her head turning about all the pain the kids had caused along with the lost opportunity.
"You mean... ( stammering ) you mean all I had to say was something clever when they asked about siblings?" Blink, blink went her eyes.