Hello,<br/><br/>1. The mayor as well as his brothers <span style="color:magenta;"><b>is</b></span> going to prison.<br/><br/>2. The mayor, as well as his brothers, <span style="color:magenta;"><b>is</b></span> going to prison.<br/><br/>Do we need comma(,) or no comma in the above sentence?<br/><br/>I have seen some books show comma and some do not.<br/><br/>Thanks.