My family and neighbors all know that I am not God and do not know all things. I cannot tell you what the RCC may have said about those specifics. Biblically, I think of these phrases from 2 Timothy 2:19…
“The Lord knows those who are his”; and, “Let everyone who calls upon the name of the Lord avoid evil."
Personally, I think that we may obtain assurance of our own state (but can lose it through unforgiven mortal sin) but cannot know with certainty the eternal destiny of someone else. When a saint is canonized, the Church does seem to take a position on someone’s eternal destiny.
From the Cathechism of the Catholic Church (CCC), there are these relevant sections:
“Outside the Church there is no salvation”
846 How are we to understand this affirmation, often repeated by the Church Fathers? Re-formulated positively, it means that all salvation comes from Christ the Head through the Church which is his Body: (161; 1257)
Basing itself on Scripture and Tradition, the Council teaches that the Church, a pilgrim now on earth, is necessary for salvation: the one Christ is the mediator and the way of salvation; he is present to us in his body which is the Church. He himself explicitly asserted the necessity of faith and Baptism, and thereby affirmed at the same time the necessity of the Church which men enter through Baptism as through a door. Hence they could not be saved who, knowing that the Catholic Church was founded as necessary by God through Christ, would refuse either to enter it or to remain in it.
847 This affirmation is not aimed at those who, through no fault of their own, do not know Christ and his Church:
Those who, through no fault of their own, do not know the Gospel of Christ or his Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do his will as they know it through the dictates of their conscience—those too may achieve eternal salvation.
848 “Although in ways known to himself God can lead those who, through no fault of their own, are ignorant of the Gospel, to that faith without which it is impossible to please him, the Church still has the obligation and also the sacred right to evangelize all men.” (1260)