Did Ahsoka know Anakin was married?

Ahsoka most definitely did not know about Luke and Leia, and she probably did not know about that Anakin and Padme were married. She might have suspected, though, that their relationship was not exactly approved by the Council.

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And another question, is padme pregnant in the clone wars?

Are Padme and Ahsoka friends?

Then, why does anakin have a scar on his face?

In the Expanded Universe, Anakin received the scar over his right eye during a lightsaber fight with Asajj Ventress. Ventress tries to bait him to engage in a battle with her. Anakin is unbalanced out of anger and Ventress takes this chance to play with him. Subsequently, why cant anakin be with padme? The marriage, witnessed by the droids C-3PO and R2-D2, was kept secret due to Amidala's place as a prominent Senator in the Galactic Republic and because of Skywalker's membership in the Jedi Order; the Jedi Code prevented Jedi from falling in love and forming attachments such as marriage.

Does Obi Wan get married?

In fact, though Obi-Wan never engaged in an official romantic relationship, as far as we know, The Clone Wars animated series revealed that Obi-Wan cared very deeply about Satine Kryze, the Duchess of Mandalore. Satine had just become Duchess, and the two of them, along with Qui-Gon, spent a year on the run.