Canadian Mountie: If a brother/sister or father/daughter maintain a common household (very common, especially as they get older), should they be able to own property jointly, sign joint contracts, pool their income for tax and other purposes, etc.? My grandmother and great-aunt were both widowed at a relatively young age and spent most of their adult lives running a joint household – should they have a legal status distinct from two clearly temporary roommates sharing a flat while looking for shidduchim?
Once the government legalized all forms of immoral and perverse initimacy (and the few remaining restrictions on what consenting adults can do probably would be held unconstitutional if anyone ever decides to prosecute a case, which isn’t all that likely), all that is left of marriage are economic and legal aspects. Is there really a halachic issue are stake here?