Clare Macguire
john and blake and sister is sarah grace
3 Bronte Sisters Charlotte, Emily and Anne
it is matty
Bernard Freemann
Sara grace
You would indicate BS after your name. That being said, with a Bachelors degree, there is usually no reference to it after a name. Degrees that are Masters and above are indicated. To some individuals placing BA or BS after a name may appear peculiar or even inappropriate.
her sisters name is Elena
Marnie is his sisters name.
If the letters are in parentheses after a name, example John Doe (Bs), I believe they stand for "British subject".
lights' sisters name is Jess
Alice's sisters name is rosalie.