Teach me!

Peter and I headed down to the DC area this past weekend to help my sister and her husband get ready for their soon to be born baby boy.  We weeded, scrubbed, vacuumed, polished, and folded.  My sister looks big and beautiful and the house is crisp and clean. I would love to get some words of wisdom from all of you out there who are aunts and uncles.  In your opinion, what makes you...