What do u do when people that u r scared of come to ur house?

well there is these people that come 2 my house & they steal there my familys freinds my mum&dad dont know about this.....i tried 2 tell them but.......they wont listen and they told me 2 stop being silly......one of them is 13 nearly 14 next month & the other 10 i am 13 but i am still scared of them coming 2 my house !!!! they live in the same town as me and they both go 2 my school please give some advise on what 2 do they r come ing down 2day please help me x