Mom was looking forward to that grand day when her son would marry.
Dad was dreading that wretched day when his son turned to equine pony stallion was wishing to marry a common born pony mare as his betrothed. The thirty some invitations had all gone out in the mail to relatives and friends of the family. He had overseen the printing of the invitations to make sure no suggestion or hint about the wedding couple were in their equine form.
Without the knowledge of his dear wife, old Dad rubbed the Arabian oil lamp alive, he awakening the Genie, and informed the magical being as to the likely uprising of the family and friends when they would meet the to ponies getting married.
The Genie was very considerate to old Dad, as reminded him that the master was his wife. Dad then persuaded the Genie that his worries were along the same lines as of his wife and the Master of the Genie.
"Yes sir, I do understand and could arrange the guests to see the happy couple in a different light of existence, if only for the time they were arriving to when then leaving. I promise not to cause them any hurt, but you need to understand that my powers for short term transforming has its limitations.
As an example, I all who came to the wedding I changed into varied species of equines in accordance to their varied family heritage, and return them to being human at midnight the same evening, the males would retain their equine size genitals for two weeks of slowly returning to what they had when they arrived. The wives would retain the same of female genitals, as wink-able black vulva's, and a twat so big they could piss a flood.
So then as along as none of them would go and mate with the ponies Frank, Charlie, Arron the mule, or Lulu and Damon, they would change back as I implied. However, if their hormones get out of hand and they begin to trade partners, then none of them will change back to being human and your wife shall need to buy more pasture land for such a herd." The Genie informed Dad, as Brendan overheard most of what was told to his father, as Brendan decided to take a big chance and do to as with Arron what appealed to his adverse ideas about his younger brother turned into a Jennet Mule.