Man, sorry to hear that.
In terms of your little one, it’s worth it. It’s not easy and often more painful because they have more questions than answers we’d like to speak out loud. But when my wife’s grandpa passed from pretty brutal cancer it helped contextualize it for her - both in the finality and in the, as we explained it, end of pain and suffering into a place without.
Prayers for you and your family. Never an easy time.