8GB of RAM is the bare minimum that Adobe recommends for running CC. You should be ok, but be aware that you won't be able to open too many photos into Photoshop or ACR at one time, or you'll find it starts to run slowly.
For a computer of that age, you definitely should run a cleanup program. This one is widely recommended.
Sorry to hear about your in-laws' health. Have you had a chance to do any shooting lately? If so, have you avoided putting the photos in Aperture, and instead browsed them with Bridge?