Sparkle,
One of the greatest and least appreciated teachings of Vatican II was that ALL of the Christian faithful–be they lay, religious, clerics–have a vocation to holiness. It speaks of the “universal call to holiness” (see Lumen Gentium Ch. 6, I think). Every Christian, in virtue of his or her baptism, has a vocation–a call–to be holy–to “be perfect as your heavenly Father is perfect.” Of course, that does not mean we must suffer anxiety over a quest for “perfection” in the terms that our society of over-acheivers defines perfection. This is not the false image of perfection and strength that is based on our own abilities and hard work. Rather, Christian perfection is being open and docile to the Holy SPirit, allowing the all-holy God to implant his image on you, to allow His grace to transform your life to mirror that of our incarnate Lord (in whatever your status–mother, missionary, etc.).
So yes, if you are a wife and mother then that is your vocation–to be a holy wife and mother–to help lead your husband and children closer to Christ (just as a priest or religious brother/sister are charged to do this although in a different manner) and to evangelize the wider world (in your own small corner of the vineyard). No one is called to be “just an ordinary Christian.” We are all called to live a radical life of holiness (even if this is done amidst a relatively quiet and “normal” kind of daily life–i.e. St. Therese of Liseux found her vocation as one of love, you can always spend your daily existence loving God and neighbor).
Hermit, Where did that come from? Judas was called as an apostle, but he failed. Just because a minority of men fail grievously in their vocation, does not mean they did not have one in the first place. We are free to respond yes or no to the vocation God gives us.