I agree with you - parenthood is as much relationship as biology

As for the grammatical aspect, I used to favour Canadian English which tends to be closer to British, but since my audience is mostly American, I am now eclectic.

I guess I'm like one of Portia's suitors in the Merchant of Venice - the Scottish Lord, who borrowed a bit from everyone:

he hath a neighbourly charity in him, for he borrowed a box of the ear of the Englishman, and swore he would pay him again when he was able; I think the Frenchman became his surety, and sealed under for another.