In this dream, you and your boyfriend represent a particular thought and action of your relative. The engagement symbolizes a stronger commitment between that thought and action. In a positive sense, green can be considered healthy. In a negative sense, which is more common, it is the color of envy or jealousy. I would ask your relative what it is that they are planning and the motive begind it. For example; one might start a diet for their health...or, want to loose weight because they want to 'show off'. Talk with your relative and I hope this helps. God bless.