Is having a brother the main reason for my empathy for both genders?

I have a younger brother myself and if nasty witch wronged him badly or took away his hard working money/assets and left him in ruins, I'll be the one coming after her. I imagine going rounds with her, seriously.

I don't like injustice being done on anyone and tend to call it for what it is, no sugarcoating it. My brother is just 2 years my junior. Even as a kid, I can't think of a time I had any bias whatsoever. Is having a brother, the main reason I'm able to empathize with both genders?

When I was 12, I once saw a young guy (not much older than 18-20 years old) skating and somehow he accidentally tripped. He hit himself in between his legs. That was a hard scene to watch. Me and two other people helped him get back up. I heard someone laughing in the background and I still don't understand what's so funny about that. I mean, would people laugh if I accidentally hit my boobs? Nope.

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9 mo
I get the feeling that people that having siblings of the opposite gender can see the hardships of both genders, understand both genders better than those that either are an only child or only have siblings of the same gender.
Is having a brother the main reason for my empathy for both genders?
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