I apologize this was a problem for you. If I could delete the thread so as not to confuse/upset anyone else I would. It made sense to me and to others. I did not require an answer from everyone, just an answer. I will be more careful in the future to not cause you a problem with my silly questions and lack of explinations. Oh, and I will be sure to add more detail.
To be fair, every single response to your OP was unsure of how many people total there are, so no, it is not true that "it made sense to me and to others" (well, I assume it made sense to you).
Now that we now the numbers (and assuming the two grandsons with you are under 18) yes, you can add them to your reservations and they can spend that night in your room. Adding them, however, does mean that they have to be on any package you may have (which may, or may not, be relevant).