In the sentence <em>The roommates moved themselves into the dorm without any help from their friends or family</em>, both pronouns <u><em>themselves</em></u> and <u><em>their</em></u> refer to the antecedent <em>roommates</em>.
Explanation:
Any <u>pronoun</u> introduced in a sentence must refer to a noun, noun phrase or noun clause that comes before called antecedent. <u>Pronouns</u> must also agree with its antedecent in number. In this case, both the <u>reflexive pronoun</u> <em>themselves </em>and the <u>possessive pronoun</u> <em>their </em>refer to the noun previously mentioned in the sentence that is <em>roommates</em>.