RE: Who Do Catholics Pray to? The Father, the Son, or the Holy Ghost?

It's a trick question. They pray to God who isn't necessarily any of the persons, just "God" in general.

Technically it's only ever possible for Christians to encounter God's Holy Ghost. You never actually see God, hear Him, or feel Him. Instead, your mind manifests His divine spiritual energy into something you can perceive, which can be anything.

Your mind might even manifest His divine energy as our Mother of Sorrows, it's really not specific.