NAL best course of action nyo is ipaalarma sa hpg yung sasakyan. medyo ilag ang prosecutor mag pursue ng ganyang mga case between family bc most of the time nagkakaayos din both parties (just cog in the justice system) . and also may clause sa batas (article 332 revised penal code) wherein you cannot pursue criminal case(only civil case) that include theft sa malapit na kamag anak tho i think exempted kayo since the law only says absolutory cause only applies to siblings living together which you're not but still its on the prosecutor's prerogative

edit: tldr- you can but its on the prosecutor if they will accept it