This is the 82nd most frequent Russian word.
своих
"One's own" (possessive, plural).
Here, 'своих' modifies 'друзьях' (friends), indicating possession referring to the subject of the sentence, 'она' (she).
Она заботится о своих друзьях.
She takes care of her friends.
In this case, 'своих' modifies 'дома' (homes) and refers back to the plural subject 'они' (they), indicating possession.
Они вернулись в своих дома после встречи.
They returned to their homes after the meeting.
Here, 'своим' (the dative case plural of 'свои') agrees with 'детям' (children), showing possession by the first-person singular subject 'я' (I).