Though I have never had it done myself, yes, actually. It was something I went over, when I was working to adopt Elliot. [Ages ago, yes, but true nonetheless.]

Is that a potential option on the table? [Yotsuyu is a bit fond of Kris and Phil, and she surely does hope that they do adopt Clarence. She's more fond of him, it's true. If it wouldn't be weird, she'd consider adopting him herself, were he fond of the idea.]