I’ve also seen US teachers spending hundreds of dollars out of their own pockets to stock classrooms.
I spent a lot of time in European schools and I’ve never heard of teachers having to stock their own classrooms or fundraise for things like playgrounds, etc.
Find out what they believe causes a household to be fatherless. Follow their logic string by asking follow-up questions based on their most recent response. Either they’ll run out of justification quickly, or they’ll back themselves into a corner. From here you can leave it be as they’ve essentially ended up causing them to question their own understanding.
One way of many.
Also find out what consequences they expect a child being “fatherless” to bring, and compare that to what actually happens when a child has a healthy household without a father in it.