The Browns argue polygamous marriages can be as healthy as monogamous ones. Photo:

The Browns argue polygamous marriages can be as healthy as monogamous ones. Photo:

SALT LAKE CITY — A polygamous family says the landmark Supreme Court ruling legalizing same-sex marriage shows that laws prohibiting consensual adult relationships are outdated even if the unions are unpopular.

Kody Brown and his four wives argue in court documents filed Wednesday that their family life chronicled on the reality TV show “Sister Wives” shows that polygamous marriages can be as healthy as monogamous ones.

The Browns are defending a legal victory they won when a federal judge struck down key parts of Utah’s law banning polygamy, removing the threat of arrest for plural families.

Utah Attorney General Sean Reyes is appealing. The state contends the law prevents abuse of women and children and courts have long upheld anti-polygamy laws.

Unlike the same-sex marriage case, the Browns aren’t seeking full legal recognition of polygamous marriages.

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