It should actually be compulsory for ALL HOUSES, don’t you think?
So that you would know the Sun Signs of those who resided inside.
So here we have a Libra mated with a Saggo – i am presuming – and Crab/Pisces children.
Or they’re flatmates only the Libra runs the show. As they tend to do even as they protest that they care only for peace and symmetry, things being done right, you understand.