Hi spring. Brothers can be a challenge to deal with.

What I do with criticism is redefine it in my mind.

EX
Someone calls me a moron.

In my mind (this is not something you say to the other person, that is bickering) I think to myself. You are right, I am more on the ball than anyone you know.

We can reinterpret anything someone says.

The other secret is to not react. Just to smile or ignore them. When we can find the place of non reaction.

Here is a very intellectual discussion of much of what I suggested
https://www.google.com/url?q=http://...1hCywu2eLJljpA