SOLVED. Fiction (series) about a guy who ran away from his abusive father with a little brother who loves solving puzzles and meets this girl at church who later vomits behind and thats where she meets the mc. Read 2022.

[Kruthisai]

more details:
i read the book in 2022 but it came out before then probably
Main character is a boy
author is a girl
Abusive father who tries to kidnap the girlfriend of mc in the second book after escaping prison
Ran away with a younger brother who loves solving puzzles whos name might start with and l or e or s
they live in their truck
was published in the late 2000 into the 2010s
Met the love interest at church; her father is the choir leader and a professor
Part of a series
title is three or four words long
cool-tone cover

[Kruthisai]

its I'll Be There by Holly Goldberg Sloan

[Rainbowheart]

Glad you found it!

I'll Be There for the link.