Has anyones cousin ever touched you inappropriate?

so im 14 and my cousin is 15 i hate when he spends the night bc when i fall asleep he touches me in the crotch and he looks at my boobs all day ive even caught him smelling the crotch of my shorts so gross and he talk so pervert around me but not his girlfriend i find this strange i know he does tis but i dont want him to know that i know or get him in trouble...also my little cousin who is like 10 pinchs my a** and kisses me whenever he gets te chance..PLZZ HELP!!!! HOW SHOULD I STOP TIS