A J Mud - the bride, my 3rd-great-grandmother, Aaltje Jans MUD
K: A: Tuinstra - the groom's father, my 4th-great-grandfather, Kasper (or Casper) Aukes TUINSTRA
G Wielinga - the groom's mother, my 4th-great-grandmother, Geertje Beerents WIELINGA
A J Mud - the bride's oldest brother, Aan Jans MUD
E A Mud - another older brother of the bride, Edser Jans MUD
B: C: Tuinstra - the groom's brother, Berend Caspers TUINSTRA. The groom, Auke, was the oldest child, and Berend was the second son.
E C Tuinstra - the groom's next younger brother, Eelke Caspers TUINSTRA; third son
The bride's father, Jan Aans MUD was deceased and her mother, Aukjen Lammerts SCHAAFSMA (a.ka. Aukjen Lammerts JONGBLOED) probably was living in Leewarden, so their signatures do not appear in this marriage record. I'll have to continue translating the marriage record, which mentions Aukjen, to make sure of my guess.
Source: Netherlands. "Burgerlijke Standregister." Database and images. AlleFriezen. http://www.allefriezen.nl : 2014.