Does this plugin exist!!

I am looking for two plugins/widgets.. and i am not sure if it exist so hopefully someone can direct me if it does!!

I am looking for a plugin that will disable/stops all POST from being displayed UNLESS you’re in that category..

IE no posts in child category will show in parent..

and another plugin/widget that will

not show the full content of the post but maybe just the title and if user clicks on it.. it will expand to full content..

can anyoe please help me????