First, try to remember that a family or personal portrait is about the family or the person, the clothes need to not be a distraction that will take the viewer away form the purpose of the photograph...you!  Second, I recommend and encourage that you bring several different outfits or at least different tops to change into.  And third, the colors; You can wear lighter colored clothing, whites or blues for example, but I usually recommend some type of dark clothing, some examples would be black, brown, or maroon.

        One final piece of advise that is crucial...everyone must wear the same thing.  If one person is wearing something different two things happen: they draw the attention away from the whole family and onto themselves, and they don't look like they belong to the group.

        If you have any other questions feel free to contact me!