how do i kep my children from geting angry at each other.

I do not think you can stop them getting angry at each other even sometimes. I used to argue with my brother sometimes but it did not stop me loving him. Maybe you could set them a fun task that they need to be a team to complete. Maybe like the ones kids do when they go to school camps e.g. getting from A to B with two planks without touching the ground, so maybe an assault course. Also you can give a little treat to reward good teamwork so they learn that getting along is better than arguing. I hope this might help.

You should treat them equally and tell them they are brothers or sisters,they should keep good relationship with each other.