The first (or surviving) children you (or your spouse) have to replace you (and spouse if any) after you die.
We don't want to overpopulate the earth, so Jim and I plan on adopting after having our replacement babies, so after they murder us in cold blood, the world's population will go back to normal.
the second set of company. You have friends/relatives visit one weekend followed by a different group of friends/relatives visiting the following weekend. It can also be defined as visits from friends/relatives spaced close together. Replacement company tends to occur quite frequently when you reside in a popular tourist destination.
When you're playing Mario Kart and take out the person in front of you to take the lead, only for another player to show up and claim it out of nowhere.
A single girl that is friends with a boy who is in a relationship. When the boys girlfriend is busy, this is who he talks to. Sometimes he might even block this person when he is hanging out with his actual girlfriend