If your cat enjoys the company of other cats, consider a companion cat as a house mate (but always do slow introductions to ensure household harmony). (cat-lovers-only.com)
But that's just what you'll need for household harmony if that partner comes with a pet. (sandiegouniontribune.com)
This provides kids with experience in the ways in which we keep a household ticking and turns them into partners in household harmony or the lack thereof. (pregnancy-info.net)