1. Older Nephew demonstrates that he knows how to flatter me: "You're a strong girl. Can you help me with this?"
2. The moment when you've distracted Younger Nephew from asking every twenty seconds if it's time for cake yet by letting him play Bejeweled on your phone, and then you realize that you may have replaced the problem of how to get Younger Nephew to allow the adults to eat their dinner in peace with the problem of how to get your smartphone back out of Younger Nephew's clutches. Fortunately, he eventually got bored and handed the phone to his older brother, who handed it back to me. (I was actually impressed with how long Younger Nephew lasted with it - Bejeweled is probably a bit advanced for a 4 year old.)
3. Youngest Niece has somehow gone from just barely walking to toddling along at speed, and will cheerfully grab me by the hand and tow me along on walks around the back yard, the front yard, along the sidewalk, etc.