Put glue between the back of the card and the ovals, but do not go past the ovals. This helps hold the card together but does not impede the “slider.”
Glue the two pictures to the card inside the ovals. You can see them on the above pictures. Press hard to seal all the glue. Lastly, work the card a few times to make sure that everything is lined up properly. During opening one picture should slide over the other covering it up.
Yor’re Father’s Day Peek a Boo Card is done. Enjoy!