Ethan has a hard time saying his "L's". When you ask him "Where's Lily?" he points to her cheek and says "Woolly".
The name has kinda stuck because even I've found myself calling her Woolly!
He loves her so much. Sometime when I turn around for even a second I find him laying on top of her while she laughs hysterically.
They will talk back and forth with one another and just laugh!