After the first couple of weeks, Hermione and Ron joined Harry for the visits, Hermione because she wanted to get to know a friend of Harry's'; and Ron because he was gathering information, wanting to gain an impression of the man, and see if he would be a potential threat or an ally in the future. Ron was getting slightly concerned because his brother was letting his shields down more and more around other people. However, it didn't seem to be causing any problems yet, so he took a "wait and see" attitude.