He got married to Elsa in Jersey in 1919.
No, Albert did not have children with Elsa Einstein.
No, according to my research he did not marry his sister. But Albert Einstein did indeed marry his relative (first cousin) Elsa Einstein. Weird huh,O_o for the smartest man known world wide you'd think he had the brains to not to marry someone in the family. Thats like a brother marrying his sister :3
Albert Einstein was married to Elsa Lowenthal for 17 years
Albert Einstein's second wife was his first cousin! Her name was Elsa Lowenthal.
Mileva Maric and Elsa Einstein
Elsa Lowenthal was Albert Einstein's second wife. She was a cousin who nursed him back to health following a serious illness in 1917. Elsa taught Albert the importance of health.
Einstein wrote daily to his wife Elsa and adopted stepdaughters Margot and Ilse.
Albert Einstein had gotten married to Elsa, and Meliva Maric
He had no children with elsa but they raised Albert children from his previous marriage 
June 2, 1919
she was special because she loved him They were cousins. When Albert got sick Elsa helped him. Then later in life they married!
yes he did; twice Mileva Marić (1903-1919) Elsa Löwenthal, née Einstein, (1919-1936)