You can uninstall or removes an installed childsplay-alphabet-sounds-nl package itself from Ubuntu 16.10 (Yakkety Yak) through the terminal,
$ sudo apt-get remove childsplay-alphabet-sounds-nl
If you would like to remove childsplay-alphabet-sounds-nl and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove childsplay-alphabet-sounds-nl
If you use with purge options to childsplay-alphabet-sounds-nl package all the configuration and dependent packages will be removed.
$ sudo apt-get purge childsplay-alphabet-sounds-nl
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove childsplay-alphabet-sounds-nl