How awful, I’m so sorry you’re going through this!  I find it very difficult to understand how a father would put his personal opinion before the health and safety of his own children.  That he refuses to see reason or even reconsider his position must be incredibly hurtful to you.  Children should always come first and that he isn’t prepared to do that, well for me, that would be a deal breaker.  Wishing you the very best of luck and hoping your family stay covid free.