Heritage question about Jamaicaa?

my whole family is jamaican we come from jamaica i was born in america and some of my cousins,nephew, and nieces are but my sister and other brothers were born in Jamaica (basically everybody in the family) but im doing a history project and my grandmother p so she cant tell me whether were mix with anything other than Jamaican (because there is alot of mix people in Jamaica) its like Trinidad people are kinda mix with indian um we have alot of hair very thick we have fair skin (brown) and were known as Jamaica black people but with any help can you guys give me any suggestion to figure out whether i can see if my family is mix with anything other than Jamaica