public class MyGamesClass {

private String platform;
private String title;
private String price;
private String img;
private String purchasedDate;
private String format;
private boolean sale;
private String saleDate;
private String salePrice;
private boolean passed;
private String passedDate;
private ArrayList <MyDlcClass> dlc;
private String dlcUrl;
private String russian;
private String cooperative;
private String online;
private String url;

...
}

public class MyDlcClass {

private String title;
private String date;
private String img;
private String url;
...
}

MyGames.myGames.add(new MyGamesClass(
    getIntent.getStringExtra("PLATFORM_KEY"), title.getText().toString(),
    price.getText().toString(), getIntent.getStringExtra("IMG_KEY"),
    date.getText().toString(), formatFinal, false, null,
    null,false, null,null,
    getIntent.getStringExtra("DLCURL_KEY"), russianFinal, coopFinal,
    onlineFinal, getIntent.getStringExtra("URL_KEY")

     ));

MyGames.myGames.get(getIntent().getIntExtra("POSITION_KEY", 0))
        .getDlc()
        .add(new MyDlcClass(
        allDlc.get(position).getTitle(), "тест даты", allDlc.get(position).getImg(), allDlc.get(position).getUrl()
               ));

public ArrayList<MyDlcClass> getDlc() {
        return dlc;
    }

public ArrayList<MyDlcClass> getDlc() {
    if (dlc == null) {
        return dlc = new ArrayList<>();
    } else {
        return dlc;
    }
}