Warning: SPOILERS for Superman & Lois Season 1, Episode 10 - "O Mother, Where Art Thou?"
Tal-Rho, who became Morgan Edge (Adam Rayner) before Lara married Jor-El (Angus Macfadyen) and gave birth to Kal.
Superman's birth mother, Lara Lor-Van, has only appeared in three movies, and her role has always been minimized in favor of Jor-El and his relationship with their son. In 1978's Man of Steel, Lara (Ayelet Zurer) had more agency in the prologue. Still, after Krypton exploded, she was similarly forgotten, and Superman (Henry Cavill) only met Jor-El (Russell Crowe) later in the film.
Thankfully, Superman & Lois didn't wait long to correct Lara's absence and introduce her in the Arrowverse. In a twist, Lana Lang volunteered to undergo the Eradicator process that Morgan Edge used to implant Kryptonian personalities and powers into Smallville's citizens. When Lana emerged from the Eradicator, she had Lara's personality, which meant Superman finally met his birth mother. Although Clark had many questions about how Tal-Rho could be his brother, Lara's answers assured him that she wasn't part of Morgan Edge's evil plan and that she married Jor-El for love as opposed to being genetically matched by Kryptonian custom, as she was with Tal-Roh's father, Zeta-Roh. Clark was also heartened that Lara was proud he became the hero she believed he would be and that he found love in Lois Lane (Elizabeth Tulloch) and has twin sons with her.
While the Superman movies always hold up the Man of Steel's relationship with Jor-El as sacrosanct, the Superman TV shows have given his mother Lara more emphasis, which she deserves. In Christopher Reeve's Supermen in the movies tend to lean on Jor-El for advice, although the DCEU's Man of Steel has a loving relationship with Martha Kent (Diane Lane). Overall, Superman's TV shows like Smallville and now, Superman & Lois, have strived for and achieved a greater balance for Superman and his Kryptonian birth parents, although Jor-El always gets more attention.
Clark in the Fortress of Solitude, Superman's relationship with his birth father's avatar lacks warmth in the Arrowverse. This is why, even though it was only in a few short scenes using Lana Lang as her avatar, it was still so moving and special for Clark and Superman & Lois's fans to see him get to spend precious time with his mother, Lara. It's a shame the Superman movies have routinely failed to deliver the same.