I'm in the process of making a list for my florist of what kind of flowers we'll need for the wedding. My parents are divorced, and are both currently in relationships. I'm planning on getting a corsage for my mom and a boutonniere for my dad, but am I supposed to get flowers for their respective SOs? Is there a rule about this, or is it one of those, "It'd be nice, but not a big deal on way or the other," kind of things? TIA!