Yes, I believe your son is correct, I don't think the word 'rapture' is in the bible. Rapture is the translated form of 'the taking away', 'taking up', etc. I would need to look up all instances. I haven't studied endtimes in a long time. I think it is really cool that you are sharing this with your family!!

I used to study Pastor Irwin Baxter's endtimes studies. He was a Godly man of faith and so knowledgeable. Some friends and I did home bible studies and a few times our topic was the endtimes series. Was so interesting and here we are today living in the endtimes. Jesus is coming, sooner than we realize.