Imma clear this up so no one gets confused,
Yes, her name is Ali Michell, yes her younger brother is Samuel McNamara
However
They do not have the same surnames
Reason being {get ready for oc story time}
So when Samuel was about 3 Ali was 6 their parents where going to separate so the mother chose to have custody for Ali because she saw Ali as HER child though she did not care for Sam
Their mother's name was Sharron Michell their Father's name was Nathaniel Merridew McNamara
So their father took custody of Sam because unlike Sharon he cared for Sam and legally got divorced and legally changed their last names