Sandcastle competition. Except Chase can easily get inside the one Jacob builds and help with the details
Aaaaa these ideas have all been so precious and cute. I love this idea and it’ll probably have to be a drabble now.
Chase climbing into the sand castle tunnels to inspect them. Jacob would be hovering at every door, peeking in to make sure he knew where the little guy was at all times in case there was a collapse and he had to dig him out.
And, of course, once the castle is complete, Chase will 100% be plucked up and set at the very top. King of the mountain!