Jesus exalts his family in heaven. Everyone who goes to heaven is a saint.
Catholics believe there is truly a family in heaven. When you ask a member of his family for something, the message will get to God.
Do Catholics say you have to pray to a saint? Absolutely not. But if you like the life of a certain saint and you feel like you connect with them you can ask them to intercede.
Our God is a selfless God. He showed us this when he died on the cross. He has no problem elevating his loved ones in heaven to help us.
Here is a good reference that explains it as well if you want to read more. You ask good questions.
Likewise, the two "witnesses" of Rev 11:3-13 are saints who had come back to life, thought by many commentators to be, again, Moses and Elijah, and by others, Enoch and Elijah. Thirdly, the prophet Samuel (not just a demon impersonating him) appears in 1 Sam 28:7-20, as the great majority of commentators hold (the "Apocryphal" book Ecclesiasticus makes this clear - 46:13,20). "Many bodies of the saints" came out of their graves after Jesus' Resurrection and went into Jerusalem, appearing to many (Mt 27:50-53). Lastly, Jeremiah returns to earth (2 Maccabees 15:13-16).
All of these occurrences involve long-dead figures (as op-posed to other resurrections such as Lazarus and Jairus' daughter), and demolish the notion of Protestantism that there is an unbridgeable gulf between heaven and earth - a sort of spiritual "Berlin wall." There is no such bridge, according to the Bible, because there is only one Church and Mystical Body of Christ, and death cannot affect the communion between its members of whatever estate. It's interesting to note that Moses and Samuel, who together appear in two and perhaps three of the five examples above, are renowned among Jews and Christians for their powerful intercession (Ex 32:11-12; 1 Sam 7:9; Ps 99:6; Jer 15:1 - implied after-death prayer).
http://socrates58.blogspot.com/2007/02/communion-of-saints-biblical-overview.html