AWWWWWWWWWW are they ever precious, beautiful little kittens. I second what LDG says, they still look quite young to me and I would not trap mom yet. It would be best to trap them all together (when mom is done nursing and they are at least over eight weeks or so) then the kittens could go into foster care??? And mom could get spayed then and either fostered out as well, or returned back outside. I would start to make some calls now and try to find a rescue/foster situation for those kittens..... They really are so adorable and thanks for posting those pictures