No, in conversation you would just say "right?" at the end of the sentence. It does not sound natural to add the "will they, won't they, are they"
To make them most natural:
a) So Neither Bob nor her friends are willing to lend her any money?
b) Either Susan’s dad or her mom will be present at her graduation ceremony, right?
c) Neither Susan’s dad nor her mom will be present at her graduation ceremony, right?
And super natural would be:
"So nobody's gonna (going to) lend her any money?
One of Susan's parents is going to be there right?
So neither of her parents will be there?