RecyclerView with different items

I am doing a recycler view that will have two different items, but I don't know how I can do that.

First: I have a ArrayList of an object and I don't know how put the times related with the date in the recycler view.

• Date - Group item.

• Times - Child item.

   Object {
   Date date;
   ArrayList times;
   }
  
  

Second: how I can change the spanSize according the item in adapter, when the position of the item isn't expected? (gridLayoutManager)