Congrats! Next stop, uncledom. I suspect you'd make a truly outstanding uncle.

I see my uncular role, on a going forward basis, as this:

Take kids away for 2-day weekend in Disney park. Feed them ~20,000 calories
of refined sugar/day. Permit them 3h sleep/night. Return them to parents,
equipped with toy drums, noisemakers and supersoakers filled with
grape-juice. Leave.

yes, that is my plan with my sister's new stepchild. his birthday is next month and he's getting something that requires hours and hours of assembly and makes lots of noise. suggestions encouraged.