Absolutely beautiful creatures!
But now for a more serious point. Someone needs to have an exterminator come in and remove them from the attic. They will live trap them and release them somewhere safe. Then the attic needs to be sealed off and repaired where they entered. 'Coons, rats and squirrels start numerous fires and deaths each year. Most attics have electrical cables running across the rafters and animals will chew these. Once they expose the conductors it's a matter of time before they short out or spark a fire. Not to mention the risk of disease from them using the insulation as thier private restroom.
I did pest control back in the mid '80's, we used to do animal removal about once a month. I've seen the damage they do first hand, as cute as they are your sisters life is worth more.
