Microsoft Access - Relationships help!

My brain still isn't sinking with information on Microsoft Access so I've watched some tutorials on Youtube which I've found helpful after undergoing a mental block with a database I've been tasked to create.

Now, I've got three tables set up. All three tables are information which, in our old database, flow nicely one by one. Using the relationships tab, I'm trying to link them together and found this video useful.

However, when I go back into one of my table's in datasheet view, I was expecting it to show the information from the other two tables in two rows underneath however it only seems to show one. I've looked into the relationships but I'm probably doing something wrong after just about grasping the concept of how relationships work (I've put some column headings from one table in another table to create a relationship).

Just not proving successful at the moment - help much appreciated!