I understand. I just desperately want assurance because I've read and heard so many horror stories of professing Christian parents whose children grow up and end up being worse than unbelievers. It's like what in the world went wrong?! The only reason I'm homeschooling is because I want to fully disciple my children and infuse a Biblical Apologetic Worldview in them. If they walk away or reject it, I'll see it as all for naught. That is really the only point of the sacrifice for me, their eternal souls.
Teaching your children is never for naught. It is a good work God has prepared for you to do. God wouldn't give you something to do and then not equip you to do it or work done in His name to not yield fruit (maybe delayed). God wouldn't give us pointless and useless things to do, as He has so much work to do that He wouldn't cause His servants to waste time (whether we see it or not--I'm guilty of not seeing this for many years LOL)
Prodigals come back to The Lord all the time. The parable is instructive and exemplifies this.
My Parents brought all three of us up in the Christian faith. One of my siblings has strayed from the faith. I stand on this as a promise with regards to my sibling:
6 Train up a child in the way he should go: and when he is old, he will not depart from it.
Proverbs 22:6, KJV
Note that Proverbs 22:6 does not say that when the Parents are old, it's when the child is old, so a Prodigal might not come back until after the Parents are dead.
10 Likewise, I say unto you, there is joy in the presence of the angels of God over one sinner that repenteth.
11 And he said, A certain man had two sons:
12 And the younger of them said to his father, Father, give me the portion of goods that falleth to me. And he divided unto them his living.
13 And not many days after the younger son gathered all together, and took his journey into a far country, and there wasted his substance with riotous living.
14 And when he had spent all, there arose a mighty famine in that land; and he began to be in want.
15 And he went and joined himself to a citizen of that country; and he sent him into his fields to feed swine.
16 And he would fain have filled his belly with the husks that the swine did eat: and no man gave unto him.
17 And when he came to himself, he said, How many hired servants of my father's have bread enough and to spare, and I perish with hunger!
18 I will arise and go to my father, and will say unto him, Father, I have sinned against heaven, and before thee,
19 And am no more worthy to be called thy son: make me as one of thy hired servants.
20 And he arose, and came to his father. But when he was yet a great way off, his father saw him, and had compassion, and ran, and fell on his neck, and kissed him.
21 And the son said unto him, Father, I have sinned against heaven, and in thy sight, and am no more worthy to be called thy son.
22 But the father said to his servants, Bring forth the best robe, and put it on him; and put a ring on his hand, and shoes on his feet:
23 And bring hither the fatted calf, and kill it; and let us eat, and be merry:
24 For this my son was dead, and is alive again; he was lost, and is found. And they began to be merry.
Luke 15:10-24, KJV