Grand Fire Trine in Moon Among Siblings

I am not really interested in knowing other people's charts but I just recently checked my sister's Mercury to find out if she's also Libra Mercury. I found out she's a Virgo Mercury... but in addition, I also found out that her Moon is trine my Moon. And then later on, I also tried to see my brother's natal chart and found out his Moon trines my moon and my sister's!

My Moon: Leo 27
My Sister's: Aries 28
My Brother's: Sagitarrius 24

Does this have any significance?

My moon actually trines my Jupiter and Saturn.

Jupiter: Aries 28
Saturn: Sagittarius 22