Sixteen years ago, Dom and Brian slept together when Dominic and Letty were taking a break. Brian, being Bi-gender, discovered he was Pregnant Later. Realizing that he couldn't stay and raise his child without Dom Figuring out what was up, he left and moved away from it all, leaving his confused family behind him.
During his Pregnancy, he decides that Dom should be able to raise his sons, so he sends him a letter, which Dom never got.
Now, 16 years later, Dominic finds a box full of letters that Letty his from him. Enraged, he decides to go find the love of his life.