M.B.
E.,
Part of this is that Geiger is in his terrible twos and has the Toddler Laws of Property in his head (I'll get to that in a minute). Part of this is also that Geiger and Brody may be resenting Zephyr joining the party and taking "their" time away from Mommy and Daddy.
If it were me, if they can't play nice then they don't get to play together. When they start fighting put them in separate rooms, make them stay there until they can chill and play nice. I would also make a point of having special time with each of your three kids that is just Mommy & Me and also just Daddy & Me. Whether it's a certain room in the house, or taking the special kid out of the house and going to a park. That may help the fighting as well.
Good Luck,
Melissa
Property Law As Viewed By A Toddler
1. If I like it, it's mine.
2. If it's in my hand, it's mine.
3. If I can take it from you, it's mine.
4. If I had it a little while ago, it's mine.
5. If it's mine, it must never appear to be yours in any way.
6. If I'm doing or building something, all the pieces are mine.
7. If it looks like it's mine, it's mine.
8. If I saw it first, it's mine.
9. If I can see it, it's mine.
10. If I think it's mine, it's mine.
11. If I want it, it's mine.
12. If I "need it, it's mine (yes, I know the difference between "want" and "need"!).
13. If I say it's mine, it's mine.
14. If you don't stop me from playing with it, it's mine.
15. If you tell me I can play with it, it's mine.
16. If it will upset me too much when you take it away from me, it's mine.
17. If I (think I) can play with it better than you can, it's mine.
18. If I play with it long enough, it's mine.
19. If you are playing with something and you put it down, it's mine.
20. If it's broken, it's yours (no wait, all the pieces are mine)
got this list from: http://www.mayitpleasethecourt.com/journal.asp?blogid=898
just google: toddler property law and you'll get a bunch of hits.