It's a bit hard to understand all the relations in your question, but I will try to give you an answer. The banner appears to have been the separate property of your brother. As such, it would pass by the terms of his will assuming he had one. If your brother had no will, it would pass according to the laws of intestacy. Pursuant to those laws, both your brother's wife and adopted son would have an interest in that banner, to the exclusion of everyone else. I hope this helps.
Answered on Jan 15th, 2013 at 8:15 PM