Mommy: "Hmm. I think it is 9, dear."
Son: "Why Mommy?"
Mommy: "Why do you think?"
Son: "Because Sammy is 9."
Mommy: "No, that is not the reason. What do we have 9 of in our family?"
Son: "Children"
Mommy, thinking carefully: "What number did you want it to be?"
Son: "5 and 2"
Mommy: "Why? Because you and your baby brother are 5 and 2?"
Son, sheepishly, but with a grin: "Yes."
Mommy: "Well, I do love the two of you best, but let's not tell the others ok? Cause they might be sad. Good plan?"
Son nods his head and kisses and hugs Mommy.

