I hope you can swim) In any case, you should not teach children to swim. You are not a coach. It is better if you hire a specialist or enroll your children in the pool. I understand that now there is a pandemic and everything is closed. We are all suffering from this pandemic right now, but I can advise you to set up a pool from this conpany https://peoriaswimmingpoolcontractor.site and swim there with your kids every day.