One, two someone took the shoe

I(H) have a younger brother with 3 children (ages 6, 4 and 2 years old)  their nanny is on her honeymoon.  And she didn’t take the kids!  Can you imagine!  Anyways, I volunteered, (or was recruited) to watch the kids from 8 am tuesday morning till 7 pm Wednesday night, so my brother and his wife can go to work.  No sooner was my sister-in-law gone than the baby (2) was up stairs and her sandals were missing but she had brought down a pair of her cousin’s crocs.  So after a hard day playing in the backyard I call the kids in and feed them dinner and get them in the tub.  The following morning Liam (the only boy 6 years old) is missing one sandal.  No idea where it is, tore the house apart looking for it.  Found the baby’s sandals in her cousin’s closet where she traded-up for the crocs.  But still can’t find his sandals.  Where do theses things go?  I’ll just have to believe there are stronger powers at work here than my organizational skills.