When you unks is younger than you.
I have to go babysit my lil unclet..
That one uncle that's a literal child.
The uncle who's a big man-baby.
My Unclet Charles is no fun, he just wants to play with baby toys.
Look at Unclet Dan! He's such a wuss.
A little baby looking uncle of yours, either very little or just baby like features
Hey Timmy, what do you think of your Unclet Steve
Assorted goofy shenanigans performed by yer parent's brother.
If both AUNTics and UNCLEtics occur during da same family visit, everyone present is likely to have a really uproarious time!