Family Tree:

Edward Anthony Masen Cullen - Parents Father - Carisle Cullen Bilogical Mother - Elizabeth Masen ( Decsed/ Post pardam depression )
Mother - Esme Anne Platt Cullen (used to be Evenson )

Carisle first married Elizabeth but she soon died soon after Edward was born. She killed herself , she was struggling with post pardem depression. This will inflict a lot of conflict in Edwards life. He feels its his fault his mother killed herself. Carisle later remarried to Esme when Edward was 6.

Siblings -
Jasper Evenson Whitlock Cullen

Emmett Mcarty Cullen

Jasper is Esme son from her first marriege. Unlike in the Twilight series Esmes husband was a good guy they just got a divorce. Jasper lived with his father till he was 12. Still sees him occasionally. Emmett was adopted by Carisle when he was 3. Carisle found Emmett in the hospital he had lost both his parent in a car crash. No other relatives wanted him.