Which of these is correct?
The mayor as well as his brothers is going to prison.
The mayor as well as his brothers are going to prison.
Which of these is correct?
The mayor as well as his brothers is going to prison.
The mayor as well as his brothers are going to prison.
As well as has a similar meaning to "not only but also" equivalent to : not only the mayor is going to prison but also his father.
In other words it means in addition to.
You can also say:
The mayor, as well as his brother, is going to prison.
When it is used as "an addition" operator, as well as does not change the number of the subject.
"Is", it's the mayor that is going to prison