Sometimes you can’t because a narcissist is a parent! The one who is supposed to protect and love you unconditionally and/or consistently!
Even inherently-good caregivers can love conditionally and/or inconsistenly when they’re still diving into life with their psychological heavy baggage and being anything but self-aware (which I find selfish, irresponsible and unfair given kids never asked for coming and that parenting should be the most noble mission on earth). Nontheless, at least they believe loving their kids the way they deserve and they truly care for them as seperate individuals.
For narcissists, though, it’s a wholly different story… They have kids to get some narcissistic supply. Their children are merely perceived as an extension of them, a sort or trophies. It explains why they never get excited for any of their kids wins no matter how big or small! Being entitled and grandiose, that’s the minimal expectation! Having a narcissistic parent is the most horrible curse one can experience…