It's a xylophone

Grandpa Chuck came to visit and brought a percussion intsrument (like the ones shown here). A little research told us that it is a xylophone not a marimba. Here is the difference: The xylophone can look similar to a marimba to the uninitiated, but there are a number of differences. The xylophone's notes sound an octave higher than written whereas the marimba is written at pitch. If I get different information, I reserve the right to change my answer.