A Jacksonville couple who spent tens of thousands of dollars on IVF say a routine newborn blood test exposed what their lawsuit calls an irreversible betrayal, their baby girl is not the biological child of the father who underwent surgery to make her possible.
Natalie Strong, 36, and Joshua Strong, 53, filed a negligence lawsuit against Brown Fertility Associates and Dr. Samuel Brown after a DNA test confirmed that Joshua is not the biological father of the daughter Natalie carried and delivered on June 5, 2025. The couple held a press conference the same day they filed suit, going public with a story that raises hard questions about accountability inside America's booming fertility industry.
Their complaint makes a blunt assertion: the clinic swapped Joshua's sperm for another man's somewhere in the IVF process, and it cannot identify whose sperm was used instead.
The trouble started with a standard post-birth blood screening. The Strongs' newborn daughter came back B-positive. Natalie is O Negative. Joshua is A Negative. Two parents with those blood types cannot produce a B-positive child.
A subsequent DNA test removed any remaining doubt. The Daily Mail reported that the test confirmed Natalie as the biological mother, but ruled Joshua out as the biological father entirely.
The lawsuit spells it out in plain language:
"The report confirmed that Natalie is the biological mother of the daughter she carried and delivered, conceived from the embryo Brown Fertility transferred into her body, and that Joshua is not the biological father."
And the filing draws the only conclusion the facts allow:
"There is only one possible conclusion: Brown Fertility used the wrong sperm."
Joshua had previously had a vasectomy. To pursue IVF with Natalie, he submitted to an invasive sperm retrieval procedure, a surgical step he took specifically so the couple could have biological children together. The couple then created seven embryos through IVF at Brown Fertility Associates.
The first embryo transfer ended in a miscarriage. Natalie carried the second transfer to term. The Strongs paid tens of thousands of dollars for a process that, their lawsuit alleges, was undermined by the clinic's own negligence.
The court filing describes the alleged failure in stark terms:
"Joshua submitted to invasive surgery to retrieve sperm that, somewhere between the freezer and the petri dish, was substituted with the sperm of a man Brown Fertility cannot identify."
That last detail, that the clinic cannot identify whose sperm was used, sits at the center of the Strongs' demand. The lawsuit seeks $50,000 in damages and asks the court to require Brown Fertility to account for what happened to Joshua's retrieved sperm.
At their press conference, the Strongs described a daily emotional toll that no dollar figure captures cleanly. Natalie put it simply:
"It took away the euphoria of having a baby. I mean, this is going to affect us for the rest of our lives."
Joshua described the contradiction of loving a child while grieving the biological connection he was promised and paid for:
"It's a daily struggle with, you know, the emotional aspect of it 'cause, you know, you do have sadness and anger, and in the same day you also have joy and love."
Natalie also raised a question that extends well beyond her own family. She wants to know whether Joshua's sperm was used to create embryos for someone else, a possibility the clinic has not addressed publicly.
"We want to know what happened to his sperm. We want to make sure it was not used anywhere else."
The Daily Mail contacted both Brown Fertility Associates and Dr. Samuel Brown for comment. No response has been reported. The clinic's silence leaves the Strongs' account uncontested in the public record so far.
Rob Marcereau, the couple's attorney from the Fertility Law Group, told the Daily Mail that the lawsuit is about more than one family's loss:
"The Strongs filed this lawsuit to get answers and hold Dr. Brown and his clinic accountable for what happened."
Marcereau added that the couple went public deliberately:
"By sharing their story publicly, they also hope to help prevent another family from going through the same thing."
Several critical facts remain unknown. No regulatory or licensing body has publicly announced an investigation into Brown Fertility Associates. The identity of the baby girl's biological father, the man whose sperm was allegedly substituted, has not been disclosed. Whether any of the five remaining embryos the couple created were also affected is unclear. And the $50,000 damage figure in the lawsuit appears modest given the scope of the alleged harm, raising the question of whether it represents a jurisdictional filing threshold rather than the couple's full demand.
The Strongs' case also highlights a gap in how fertility clinics are held accountable when something goes wrong. Patients hand over biological material, pay enormous sums, and trust that the most basic chain of custody, matching the right sperm to the right embryo, will hold. When it fails, the consequences are permanent and deeply personal. No corrective procedure exists.
Families who follow the rules, pay the bills, and trust the professionals deserve better than a clinic that cannot explain whose child it helped create.
