Ideally, you only choose to believe that which works in your experience
and, since everybody's experiences differ, respect the differences in your and your brothers' beliefs.
Understanding that your beliefs are merely beliefs, you are under no obligation to prove them. Only share them when you have been asked to. You may reach out in compassion to shine a light on confusion.
It is like an opinion. No one wants to know your opinion because they already think highly of theirs. When the student is ready, the teacher arrives.