Four gay couples on Monday filed a federal lawsuit to force Ohio to recognize their marriages on birth certificates.

Al Gerhardstein of Cincinnati is representing the couples, three of which are lesbian. Gerhardstein in December won a federal court ruling on behalf of John Arthur and Jim Obergefell – who married in Maryland as Obergefell battled a diagnosis of Lou Gehrig's Disease – to have their marriage recognized on Obergefell's death certificate. Obergefell has since died and the case has expanded to include all legally married gay couples in Ohio. The state has appealed the ruling.

“Last year the federal court ordered Ohio to end discrimination against married same-sex couples on death certificates,” Gerhardstein said during a press conference announcing the lawsuit. “Today these moms and dads seek to end discrimination against same-sex couples and their children on birth certificates. At both ends of our lifespans, a marriage is a marriage; Ohio must recognize same-sex marriages and the families founded on those marriages throughout life.”

One woman in each of three plaintiff couples from the new lawsuit is pregnant through artificial insemination and expected to deliver in June. The fourth couple, two men who live in New York, adopted a boy last year who was born in Ohio.

The four couples want Ohio to list both parents on their children's birth certificates.

“The impact this has on families is enormous,” Elyzabeth Holford, executive director of Equality Ohio, the state's largest LGBT rights advocate, said in an emailed statement. “Birth certificates are primary identification documents for medical care, access to schools, and travel. A birth certificate also announces to the community: this is a family.”

(Read the complaint.)