Our kids on daddy's fire engine. My kids' daddy is the man who lives with them, takes care of them, who loves their mommy, and who also gave them their DNA and ancestry. All of these things, combined, for them , makes what is "father." They will probably never hear someone say a bad word about him. They will also never be asked an ignorant or nosy question or be told who their father can or cannot be whether based on nature or nurture. They have a mother and an adoptive grandfather who are examples that not all daddies are involved the same way theirs is. There are different connections, different relationships, and for some, no relationship at all. They have four grandfathers, a biological one they won't hear me talk much about, a step-grandfather they'll get to see every so often, their grandfather through my adoption, and their grandfather through their daddy. They have more great-grandfathers than they can count because several of their...