Classic

Sans would usual let Papyrus watch you but others times he lets either Geno or Science Sans watch you.

Fell
If he does bring you with him to the others he lets Dust or Killer take of you.

Blue
Dream and Ink is the first ones to come to his mind

Error
He would leave you with Nightmare if he isn't busy watching his kid too

Ink
Surprisly he would go to Dance sans or Fresh

Dream
Ink,Blue,classic or sometime nightmare because he knows that they do argue but he would never hurt you.

Blackberry
Dust Horror,Cross Chara or Fell since he trust them more

Horror
He leaves you with Classic or Reaper because why not?

Cross Sans/Chara
He would drop you off with Chara or he will leave you with Horror.