From what I have heard the kittens were born in a shoebox in the ladies apartment, not outside, so they have been indoor cats the entire time. I don't think they have been treated for worms yet though, but again that would be the first thing I did on Monday.
What I've been considering is just going to ice the kitten up Monday and taking it straight to the vet and getting all the required shots and whatever else it may need. Is that the best approach? Would that ensure that my older cat Sierra stays healthy?