ash loomis (alias: ash strode) is the biological son of billy loomis and wendy strode, conceived before billy and sydney started dating, but before billy hooked up with christina, wendy was not at school while she was pregnant, as to avoid rumors and being called names. she was not present during the ghostface killings and gave birth to her son that following december.
ash was born in woodsboro but grew up else where. he was arrested at 16 and framed for murder of his group of friends, due to his last name being loomis and being the only survivor of the ghost face attacks in his town.
he was acquitted of the murders when he was 19, after a lawyer took his case pro bono to get some answers. despite being proven innocent, ash was unable to find a decent job aside from a mechanic who was willing to hire someone with no high school diploma and no actual experience.
ash became a really good mechanic, legally changing his last name to strode to put his father's legacy behind him, after moving to modesto. while living there, he meets sam carpenter, who turns out to be his half sister, and a few months younger than him. they connect and start building a familial relationship when she gets a call that her sister had been attacked. he goes with her to woodsboro, his first time there since he was born, and accompanies her during the new ghost face attacks.
after the first couple of attacks, he stays with tara while sam goes looking for answers and creates an "older brother" bond with her - which grows over the next year.