What's the Name of That Book??? discussion

I read this book about 5 years ago. I read 4 of them actually. The book is actually a series of books but if anyone could find at least one of them, that would be great. I remember that in the beginning of the very first book, A very rich old lady dies and her will is hidden somewhere. Her grandson has photogenic memory and he finds it by opening his mothers favorite handheld golden statue by imitating how his cat opens a gate. His grandmother knew he would remember. I remember that He and his sister travel the world to find some treasure (written in the will), but they are being chased and gunned down. I remember that they had been in paris and venis. There was a joke I remember too! It had something to do with the yakuza (that asain gang mafia thing) and a pun having to do with starwarz. Jar jar binks or something says yakuza anikan? idk i forget, but that was the boys joke. The book is definetly a childrens book because the books have their own website with kid games! but thats all i remember.

Is it the 39 Clues series?The Maze of Bones

Sounds like The Sword Thief . There are many books in The 39 Clues. The joke you referenced is in The Sword Thief (book 3).

OH MY GOD thank you!! I love this group!