Six families headed by gay couples have amended their 2012 lawsuit to add claims challenging North Carolina's ban on marriage for gay and lesbian couples.

The plaintiffs' original suit challenged a North Carolina law that bans couples from jointly adopting a child.

The North Carolina Attorney General's Office announced earlier this month that it would not oppose allowing amending the complaint to include claims challenging the state's marriage ban.

The couples are represented by the ACLU, which has filed similar challenges in other states, including Pennsylvania.

“The adult plaintiffs seek the same legal recognition of their family relationships afforded heterosexual married spouses and their families for the same reason all families seek such relationships,” the amended complaint reads.

ACLU attorneys argue that the ban hurts the children of gay couples.

Legal recognition would avoid “numerous psychological, social and financial detriments that arise from a lack of a legally recognized marriage or a legally recognized relationship between parent and child.”

North Carolina voters last year approved a constitutional amendment which limits marriage to heterosexual couples, strengthening the state's marriage laws against a constitutional challenge. However, last month's Supreme Court ruling striking down the Defense of Marriage Act (DOMA) appears to have weakened such amendments.