Parallel (to) (4)
'parallel to' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alongside that I've seen before include "next door" , "Next to, another boat say" , "Side by side" , "Adjacent to" , "Bordering" .)
(Other definitions for akin that I've seen before include "Similar in quality" , "Close" , "Related or similiar" , "Related by blood" , "Similar, like" .)