waiting for an episode where

Not really, you are aware in many cultures siblings of the same sex sleep in the same rooms even as teens. Only here in the US & UK have I heard people make it a big issue. Back in the 80s I had two friends in jr high school who shared a room with a brother. I remember being surprised a little bit but thankful I didn't have to share a room with my sister. He stated in the newest episode he was 10yrs old. So I don't see the show rushing to do that based on age.

I'm not saying I support a brother and sister sharing a room. If you have enough rooms in your home I feel a child should their own space esp. when they are teens. But, from what I remember in the 80s sharing a room was common. I had a few good friends who shared rooms with sisters too and the extra bedroom in the home was the guest room.

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i'm sure (if the show lasts) when Sheldon grows a bit older.. he leaves for L.A. ?
or i guess that'd be the season finale where he meets whats-his-face

When I was child I almost always had a room of my own.

However, when we went to the shore for summer vacation, in the years when I was about eight to sixteen, I did sometimes sleep in a bedroom with two beds, and thus possibly shared a bedroom with a brother or sister. And one of the beds in that bed room was a large bed with room for two or three kids at the same time. I know that sometimes and somehow I shared that bed with at at least one sibling, but I don't remember if it or they were brothers or sisters.

Maybe I should ask them if they remember.

Anyway, when I was nine and ten my older sister and I visited our grandparents, and as I remember we sharerd the guest bedroom when we staryed there.