Haven't played in a while, so don't know if they already exist…
I've heard unique dialogue exists for 'mom'… not sure if 'mother' gets the 'mom' dialogue or the default dialogue… if it even fits…
I would like to see unique dialogue for 'sibling', 'owner', 'pet', and 'toy'…
I could try to write the dialogue for these if you wish to include them but you and your team don't want to write them yourselves.