If Anakin won the battle on mustafar

Darth vader is born

Obi wan and vader clash their sabers both trying to go for eachothers neck while in side the medical station something happens.

Padmé: Oh space Jesus! Please I need someone! I'm going into labor! (Or whatever space people say)

Padmé gets carried onto a table by a droid and she begins to give birth at that moment.

Back outside Obi wan is struggling against Vader when he sees vaders lightsaber turn a molten red and somehow it goes through his.

Obi wan stunned on how Vader has done this he keeps up with him almost dying many times when he sees his form or master Quoi gon jinn (or whatever is name is spelt)

Obi wan: master?

Space Jesus's master: Obi wan you must purify your kyber crystal even further than it is.

Obi wan: yes master.

After seeing his master one last time obi wan puts him focus into his lightsaber and then it extends further the color change from white to a extremely bright green so bright the clones Vader brought were blinded.

(For info this lightsaber type isn't canon I made it tf up deal wit it)

Vader covers his eyes from the brightness still being able to sense where obi wan is. Obi wan takes one last strike at Vader and hears crying from inside the crys of two new borns.

Vader try's to kill him but obi wan force pushes Vader knocking him unconscious and obi wan runs inside.

Padmé died giving birth to her twins

Luke. And leia.