Thank you for the clarification on the fiancée!
I think you are wise to get some preliminary information about college costs, etc. This is good information to have.
Once your kid(s) reach 11th grade and really start looking at colleges, you will have much better data on which to make some college decisions…and understand the finances.
There WILL be post high school options for both of your students.
My free advice…if there are financial considerations, please convey these to your students before they apply. That way they will understand that if money isn’t forthcoming…an acceptance might need to be dropped from consideration.
And also, look for colleges where the costs to attend are more modest to begin with. They are out there!