The New Born Year by Kris Ripper

Alison Jennings followed her big brother all the way to California, and most of the time, she's glad she did. But when her boyfriend dumps her on Christmas morning, she shows up on Truman's doorstep to find he (and his husband) on their way out the door to their new beach house for the week.

Hugh and Truman aren't the only ones heading to the coast. They have a whole week-long New Years celebration planned, with a big group of their friends. Ally had planned to spend a lot of that time with her lousy now-ex, but now that she's here, she's wild with curiosity about all the stuff going on just below the surface of every conversation.

It turns out there's a lot she doesn't know about her brother and his chosen family, and Ally might discover some things she didn't know about herself along the way.