For the divorced parent situation, see FAQ: Divorced parents, financial aid, and net price calculators , but note the pending change of the definition of custodial parent from the one you live with to the one providing the most financial support. Some colleges require only the custodial parent finances, but others require both parents’ finances; you may have to dig around the college financial aid web pages to figure out what each college wants.
If the parent with the real estate assets and income is needed, then that can make estimating with NPCs less reliable, especially if the NPCs do not ask detailed questions specific to real estate assets and income.