Barron Trump was noticeably the only one of his siblings to skip his brother Donald Trump Jr's wedding to Bettina Anderson in the Bahamas this weekend.Questions have mounted over why the college student, 20, did not join Ivanka, Eric and Tiffany Trump on the island to celebrate the nuptials.Don Jr married socialite Anderson this weekend at the sun-soaked event limited to their closest friends and family members.His father, President Trump, was not in attendance, nor was his stepmother, Melania. It was first whispered that the wedding would be held on the luxurious private island of Little Pipe Cay, where the couple spent an idyllic vacation last year, after tensions in the Middle East forced the couple to dramatically scale back their White House wedding plans.But the Daily Mail learned that Bettina had such fond memories of her time on Norman's Cay in the Exumas with her best friend, Hope Smith, that it was under strong consideration as the venue.Hope, a fashionista and former Playmate of the year, and Bettina are seen in a YouTube video of the trip, frolicking on the white-sand beach of the private island, with a stunning mansion in view. Donald Trump Jr and Bettina Anderson quietly tied the knot Thursday in Palm Beach, then jetted off to the Caribbean for a sun-soaked celebration limited to only their closest friends and a few family members Questions have started to mount as to why college student Barron did not join his siblings Ivanka, Eric and Tiffany Trump on the island to celebrate the nuptialsNorman’s Cay, in the isolated Bahamian island chain of Exuma, is an exclusive and lush paradise beloved of 39-year-old Bettina, who previously spent time there with her close pal.It has a private airstrip with its own customs clearance for the private jet crowd and is described as a ‘members only sanctuary’ for visitors enjoying the villa estates and private yacht facilities.The only way to get there is by a chartered plane or boat. Once there, accommodation costs at least $1,400 per person per night, ensuring maximum discretion.Ivanka Trump shared a photo cuddling up to her husband, Jared, while Lara Trump shared a photo with her husband, Eric, standing on the beach ahead of the reception Lara also shared some snaps from the wedding weekend, including one featuring the Trump women. From left, Kai, Tiffany, herself and Ivanka posing togetherWhile Don Jr’s father did not attend the Bahamas ceremony, the couple hopes to hold a third wedding celebration at the White House in the future, where Trump and Melania can attend, sources told People. The couple's marriage certificate, obtained by the Daily Mail, shows that the President's eldest son and the glamorous socialite officially became husband and wife in a secret ceremony held at the West Palm Beach home of Anderson's sister, Kristina McPherson, on Thursday. On Saturday, the new bride took to her Instagram Stories to share a look at their wedding bands along with a gushing message to Don Jr. She posted a black-and-white shot of their hands, with their understated silver rings on full display.'Forever yours, forever mine,' she wrote with a white heart.She followed it up with a message that said: 'The whole point is to marry your best friend.'