I have three brothers. I am the oldest. The one just younger than me has a huge dick. He used to tease me about being bigger than me since I was older. The two youngest are also hung, but not as big as me and my other brother.
All of my nephews are hung as well. We once all showered together in a gang shower while on a family reunion vacation at a community swimming pool . I feel bad for my brother in law, married to my oldest sister. He is the athlete in the family, but has a small dick. All of his sons have much bigger dicks than him. He seems fine with it. I think being a athlete, he is pretty used to showering with guys and probably doesn't really care that much about the whole issue. We all have strengths and weaknesses.