Best option is to remove jquery at all!
However this case both widget do bundle their own jQuery. Your multi define error could related to something else.
Did you add the noConflict feature when loading both jQuery files? Search the forum and you will find multiple references on how to implement the noConflict feature into a jQuery library, resolving the multiDefine errors.
See for instance this forum question: 'How should jQuery plugins be incorporated into a widget?'