This does not sound unreasonable. As long as all of the kids receive something of his to remember him, your proposal sounds fair. I've traced my family tree and I completely understand the desire to possess an item that once belonged to an ancestor. An adopted family and even step family can have strong ties to the current generation involved, but for generations down the road, this tie will likely not matter nor be traced because it's not the blood from where they came. Military honors are an excellent memoribilia to pass through generations. I hope your siblings understand your wishes are not just for you but for your fathers future family members to cherish.