How to stop string repetition on array

We I have this college assignment where I have to Read a file with a list of names and add up to 3 presents to each one. I can do it but the presents are repeating and some people in the list are getting the same present more than once. How can I stop it so each person receives different variety of present each time?

Here is my code:

public static void main(String[] args) throws IOException {

        String path = "Christmas.txt";
        String line = "";

        ArrayList<String> kids = new ArrayList<>();
        FileWriter fw = new FileWriter("Deliveries.txt");
        SantasFactory sf = new SantasFactory();

        try (Scanner s = new Scanner(new FileReader("Christmas.txt"))) {
            while (s.hasNext()) {
                kids.add(s.nextLine());
            }

        }
        for (String boys : kids) {
            ArrayList<String> btoys = new ArrayList<>();

            int x = 0;
            while (x < 3) {
                if (!btoys.contains(sf.getRandomBoyToy().equals(sf.getRandomBoyToy()))) {
                    btoys.add(sf.getRandomBoyToy());
                    x++;

                }
                
            }

            if (boys.endsWith("M")) {

                fw.write(boys + " (" + btoys + ")\n\n");

            }

        }


        fw.close();

    }
}