Liam

Liam is the downstairs neighbor of Evelyn.

History
When Liam and his partner Jaime, heard creaking in their ceiling and started to see cracks, they worried about their neighbor Evelyn, whose apartment was directly above theirs. They tried calling her, but got no answer, so they called 911. Station 19 responded and found that Evelyn was trapped and her apartment was so full of stuff that it was dangerous to go inside. After Evelyn had been rescued by Andy, Jaime and Liam both told her how glad they were that she was safe, even though her apartment had fallen into theirs.

Romantic
He is dating Jaime.

Friendships
He and Jaime are friends with Evelyn, who lived in the apartment above them. She came over to spend time with them and they were worried when she didn't answer her phone.