I think you'll find that all five are the same family, despite the variant spelling of White/Whyte/Whytt.
Have you viewed the originals of these five baptisms on the Scotland's People web site? As I said, they may contain more information that is in the index there and on FS.
The sort of extra information that you sometimes get with a baptism is the father's occupation, where they lived, and names and even residences of witnesses to the baptisms, which may provide useful clues to the parents' family relationships.
I see that you said that they were married in 1782. There is no listing of a marriage on either SP or FS, so where did that come from?