Chemistry (part five)

The last time we saw Andy was at school with Jordan and Jake trying to find out who JRC is.

"I don't know, I was hoping that you guys would've recognized it." said Andy in a disappointed tone.
Bring! Bring!
"Well, there's the bell... Who do we have next?" asked Jordan.
"Umm, we are suppose to be having Mr. S, chemistry, but everyone is saying that there is a creepy new sub." informed Jake.

In Chemistry...

"Everyone, please take your seats quietly." said the sub.
Wow! He looks like he's in college! I've never seen a sub this young! Andy thought. Why do I think that I've seen him before? Andy questioned himself.
"Today, we will not be doing any textbook work, instead, I would like to do some hands on experiences. Starting off, I would like to go over some rules for how to make the stuff I'm teaching you: just follow exactly what I do. First of all, grab your green vile and only put a drop, like this." explained the sub. "Then pour all of the blue vial into the jar with the one drop of green. Finally, add some of the red vial in, stir and then I will come around and collect these."
Hmmm, mine keeps changing colors, I've never seen anything like it. observed Andy. Andy finally saw boxes with the other period's numbers on them. Each period's was different. That's strange! Why wouldn't he do the same experiment of all classes? Andy thought.
Bring! Bring!
"Thank you everyone! Goodbye!" said the sun in a weirdly sweet tone.
He quickly ushered out all the kids and quietly closed the door behind him. Jordan and Jake walked with Andy.
"Isn't it weird that he never gave us his name like normal subs?" asked Jordan.
"Yeah, kinda creepy huh?" said Jake.
"I felt like I knew him... I've seen him before." said Andy.
Andy suddenly got a huge, overwhelming rush of energy and started seeing another vision!
Andy's mom was there with his dad. Andy's mom was pregnant. 
"I can't believe I'm going to be a father! It's going to be a son-son-father day when they can walk and talk!" exclaimed Andy's father. 
"Very exciting indeed! But, we should go get some rest." wearily said Andy's mom. 
Andy's mom gave her husband a kiss goodnight and slowly made her way up stairs. 
Andy fell and came back to reality with a hazy mind.

What do you think that vision means? Comment down below! Thanks!