A.B.C-Z about sibling composition

This year is A.B.C-Z 15th anniversary.
A.B.C-Z was born on August 29th 15 years ago.

Hasshi, who was 15 years old at the time, joined A.B.C. (Kawai,Totsuka,Tsukada,Goseki) and then they became A.B.C-Z.
Those of who except Hasshi were  already adult at that time. 
Hasshi was still Jr high school. I think this is Emoi. It's emotional thing because this situation makes them like brothers.

Let's see the actual sibiling composition of ABCZ. It's miracle.

First of all, the older members (Kawai,Totsuka,Tsukada,Goseki) all have younger sisters and no younger brothers.
Hasshi has an older sister but no older brother.

That's why Hasshi is like a cute little brother for older brothers.
For Hasshi, the four are reliable older brothers.

Anyway, The sibling composition of A.B.C-Z is interesting.

Gocchi : one older sis and one younger sis so 3 siblings
Tsuka-chan :  2 younger sisters so 3 siblings
Tottsu :  one older bro and one young sis so 3 siblings
Fumito :  one older bro and one young sis so 3 siblings
Hasshi : one older sis so 2 siblings

older members are 3 siblings, and Fumitotsu has the same sibling composition, Tsuka-chan is the eldest son, and Gocchi is sandwiched between women.
Fumi, Totsu and Gocchi are the middle child. 
I think it's unusual.

Sometimes, they talk about their siblings. The stories are very interesting. And also, I can understand they are very good familiy.
It goes without saying that Hasshi and his older sister are  good sibilings.
Recently, Fumito was on a date with his older brother.

Also,I really like their nephew and niece episode.
Tsuka-chan has seven nephews and nieces, right?
It's heartwarming that member do as uncle in private.

I hope that forever A.B.C-Z is a group with strong bonds as much as brothers.