Unfortunately many schools in Europe have the alternative of accepting public funding or closing down. A school which accepts public funds may not discriminate on gender nor on other basis, meaning that whoever accepts the school’s outlook and educational program and is willing to pay, can enroll their children. To spell it out, nonjewish children have to be accepted, as well as children from non observant families. Antwerp has a significant haredi community and that’s how they get to have a non-state-funded yeshiva. But the school for girls is within a state framework (in Belgium there are many schools which are private but partially / significally funded by the state). I would imagine the boys will be either expelled from the school if they are disruptive enough, or the tuition won’t be paid and this too would solve the problem, or (this is wishful thinking, but let’s not rule it out) the kids will be positively influenced and after a few weeks the girls’ school will arrange a male tutor for them.
