This is not something you should be hesitant about. The rules are very clear. Start by reading all the help given in the other thread. Also consider using other IRS resources: https://www.irs.gov/help/ita/whom-may-i-claim-as-a-dependent and https://www.irs.gov/help/ita/what-is-my-filing-status

Try to earn your fee on what is pretty basic, but not necessarily very obvious filing questions. This is what VITA does for free all the time. https://apps.irs.gov/app/vita/content/globalmedia/filing_status_decision_tree_interview_tips_4012.pd... and https://apps.irs.gov/app/vita/content/globalmedia/dependency_exemptions_4012.pdf