It’s really just luck that the timing for this worked out.

↓ Transcript
Rocky walks through the front door and sees a decorated Christmas tree with a few gifts under it.

Rocky (loudly): Carly!
Carly: Yes, Rocky?
Rocky: I thought we agreed we wouldn't be doing a tree.

As Carly talks, he reaches into the hall, where Rocky cannot see.

Carly: I believe the agreement was that we would put off Christmas until we found...

Suddenly, Grampy is there, standing with his arms out to Rocky.

Rocky (in a small voice): Grampy.