Young Douglas Trio

There are three cute young Douglas squirrels living in one of my trees. Their mother, who I just became fast friends with, sadly, was hit by a car yesterday. I think she may have been still nursing them as her nipples had matted fur around the .

They were down the tree today and eating some of the nuts and seeds I placed at the base of the tree. I put some water out for them too. Do they look old enough to survive on their own? They seem sorta older to my not-knowing-much-about-Douglases eyes. They certainly are getting around ok and eating things. Any recommendations?