Off season wedding pros cons and suggestions

Hello I am planning to do my wedding in 2026 of March. I am a teacher and I am using my March break time as my reason for this. Also because it's a small wedding i thought that it would not be a big deal for me doing it March. I'm from Canada so yes I can be cold during March. People are trying to suggest me to do it may 2026 but the reason i am not too keen with that idea is because my brother has his date for September 2026 so I think those are too close together. Some of my family members don't mind that idea I know the reason is for them to avoid the weird March weather and i don't it's fair that my brothers wedding and my wedding can collide because of the pre wedding events that happen before. Can anyone help me i am very stuck on what to do?