[OT] Asking for a different kind of song recommendation

My sister-in-law, who lives on the other coast, has got it into her head that next time we’re all together, she and I have to sing karaoke together. Now keep in mind that I’m old — and will probably be considerably older by the time we see one another — and I haven’t sung in public since I was 12. Not even “Happy Birthday.” I’m not quite tone deaf enough to not know how bad I am.

Apparently she’s at least as bad.

I don’t know how drunk she expects both of us to be — which would be a feat in any case, since neither of us drinks.

But she’s fixated on this,  and wants me to pick the song, so what duet should I choose?