Here is what the scriptures have to say about that.
Matthew 22
8 Then saith he to his servants,
9 Go ye therefore into the highways, and as many as ye shall find, bid to the marriage.
10 So those servants went out into the highways, and gathered together all as many as they found, both bad and good: and the wedding was furnished with guests.
11 And when the king came in to see the guests, he saw there a man which had not on a wedding garment:
12 And he saith unto him, Friend, how camest thou in hither not having a wedding garment? And he was speechless.
13 Then said the king to the servants, Bind him hand and foot, and take him away, and cast him into outer darkness; there shall be weeping and gnashing of teeth.
14 For many are called, but few are chosen.
Can you point me to the place in the Bible, or in this particular example, that requires "worthiness" in regards to witnessing a wedding to be determined by the answers to the questions in Post No. 13?
Failing that, can you point me to a scripture that describes "worthiness" other than this..."And when the king came in to see the guests, he saw there a man which had not on a wedding garment"?
How would membership in and obeying the ordinances of, the LDS church in order to be worthy to witness a wedding, be commanded prior to this requirement by the modern LDS church? Where is the revelation received by Joseph Smith that commands this exclusion?
Is this something that didn't need to be "restored??
Is there some description of the aforesaid "wedding garment" available in Biblical scripture? Please cite.
I would really like to see an explanation for the exclusion of family at LDS weddings. It didn't affect me personally, but I have seen it cause great grief for quite a few folks.