I don’t know what the law says or if it varies a lot from school to school, but here’s how it worked out for me:

I had two sets of parents who shared custody 50-50. My bio parents both remarried after they got divorced, so 4 ppl including stepparents.

My dad claimed me on his taxes each year, my mom claimed my other sibling.

Both sets of parents were expected to submit their tax returns to calculate my expected family contribution (EFC) for financial aid. The EFC was outrageously high, and the school refused to grant me more aid during my sophomore year when my mom lost her job.

Sounds like your plan to start kiddo out in a community college is awesome!!