No. Just because they are both dark-skinned doesn't mean they're related. Mace was a loyal Jedi, and thus had no kids. Plus, the timeline would be all wrong.
Before being signed on as Mace Windu for Star Wars: Episode I The Phantom Menace, Samuel L. Jackson was slated to appear in a cameo role as Grando Calrissian, Lando's father.
Finn is not only Lando Calrissian's son but Mace Windu's grandson. Mace Windu could have had a child several years before the Clone Wars, then hiding him (Lando) on Cloud City to keep Lando safe as Mace knew that the Sith were nearby and building strength.
Lando Calrissian, Junior, nicknamed Chance, was a Human male born around 41 ABY to Tendra Risant Calrissian and Lando Calrissian, Senior. The curly-haired child was nicknamed Chance and was adored by his father, who, along with his wife, brought up their son in a life of affluence.
It is clear at force-sensitivity is passed from parent to child and that Mace would not have had any children due to the rules of the Jedi order. There is absolutely no reason however to assume that he didn't have other relations, even siblings, who were force sensitive but had foregone Jedi training.
Kadara Calrissian was a female individual and the daughter of Landonis Balthazar Calrissian. In the years of peace after the Galactic Civil War, Calrissian attempted to start a family, and his daughter was born in 13 ABY.
Billaba became Windu's Padawan and trained under the Jedi Master in the ways of the Force. During her training, Windu allowed her to study Form VII variant known as Vaapad. She eventually became a Jedi Knight, renowned for her skills with a lightsaber and favored Form III when teaching other Jedi.
Ghôsh Windu was the Korunnai tribe/family to which Mace Windu belonged. It was once loosely affiliated with Ghôsh Rostu. Windu and his "brother" Kar Vastor were the only known remaining members of the ghôsh by 22 BBY.
Trained as a Jedi Guardian, Windu was considered to be one of the best swordsmen in the history of the Jedi Order and had created the modern seventh form of lightsaber combat, Vaapad along with fellow Jedi Sora Bulq. He was the only practitioner of the form who did not fall to the dark side.
In a recent interview with the Huffington Post, Solo co-writer Jonathan Kasdan made it clear he viewed Lando as pansexual — and wanted his motives to be left up to sexy, sexy interpretation. (Kasdan's co-writer and father Lawrence Kasdan was more ambiguous in his response.)
Ever wondered what Lando was short for? His cane from The Rise of Skywalker has this inscription: Baron Landonis Balthazar Calrissian III. This is indeed something of a scoop – even the Wookieepedia, home of everything exhaustingly Star Wars, which lists him as merely Lando Calrissian.
Mother Talzin to Mace Windu. Mother Talzin is a neutral character who sometimes acts as an antagonist in the 2008-2020 animated TV series Star Wars The Clone Wars. She is the manipulative leader of the Dathomirian Nightsisters and the Frangawl Cult and the mother of Darth Maul and Savage Opress.
Mace Windu was a revered Force-sensitive human male Jedi Master and member of the Jedi High Council during the last years of the Republic Era. During his time in the Jedi Order, he once served as elected leader of the Jedi and, during the Clone Wars, as a Jedi General in the Grand Army of the Republic.
A grim Jedi Master with an amethyst-bladed lightsaber, Mace Windu was the champion of the Jedi Order, with little tolerance for the failings of the Senate, the arguments of politicians, or the opinions of rebellious Jedi.
Mace Windu appears as a Force ghost in the alternate history comic Star Wars Infinities: The Empire Strikes Back in a vision to Darth Vader, though this may only be a mental vision in Vader's mind as opposed to an actual Force ghost.
One of Yoda's Padawans was Dooku, who was taken by the Jedi Order after being abandoned by his family. Yoda taught him the Jedi arts, but Dooku ended up turning to the dark side and was taken as apprentice by Darth Sidious, thus becoming Sith Lord Darth Tyranus.
In 19 BBY, the lightsaber was lost when it was dropped out of the window of Supreme Chancellor Palpatine's office prior to his death. In 18 BBY, Duros salvagers recovered it and gave it to Senator Sano Sauro.
Unlike most of Revenge of the Sith's Jedi casualties, Star Wars never showed Mace's body, which means that a chance exists for him to have survived in some way. Although it didn't happen in Obi-Wan Kenobi as some fans hoped, Mace Windu could potentially turn up alive at some point in the future.
Mace Windu is not a 'Gray Jedi. ' Not in canon nor in Legends did Mace ever veer away from the Jedi Order or Jedi Code. In fact, this over-reliance and dedication to the Code played a huge part in his and the Jedi Order's downfall.
The offspring of Darth Sidious' cloned son, Rey inherited her grandfather's power in the Force. Born on the planet Hyperkarn in 15 ABY, Rey was the daughter of a man named Dathan and woman named Miramir, but their names were later lost to history.
But with the sudden reveal that she was Palpatine's granddaughter, fans were left to wonder whether that was the original plan, or a last-minute decision. And answers were finally given by Rey's actor, Daisy Ridley, who admitted that Obi-Wan was originally Rey's father.
Lando then says, “Well, let's find out…” The scene plays like Lando is offering to help Jannah find her family (and even struck some viewers as if the “old smoothie” was hitting on a woman 55 years his junior).