ds1 and ds2 are 2 yrs apart
ds2 and ds3 are 18 months apart
ds3 and ds4 are 18 months apart
ds4 and ds5 are 3 years apart
My Dad has one brother and one sister and they are all 5 years apart
My Mom has a brother and a sister and they are all 2 years apart
My sister in law has 3 kids (b,g,g) and they are all 1 year apart
I have 3 brothers and my oldest brother is 3 years older than my second brother and the rest of us are all 2 years apart
My dh's fam he has (b,g,b,b) and they are all 2 years apart
That's prob enough examples :) I really don't think it has a whole lot to dowith it as I think the majority of people try to have their kids about 2 years a part and most families seem to have both genders...