It applies to all types of kin relations. Dramatically fewer people have a same- sex sibling. The number is probably down from say 0.9 to 0.4 or less.
Few people have friends with brothers and sisters to compare them to, to understand heritability.
We are becoming more and more tolerant of obviously unrelated people playing relatives on tv. I say that because when you see a real family resemblance in person, it's intense.
The only experience of having g a much older or younger sibling must be nearly nothing, now, too. It's sad that all these effects seem to make people even more likely to perpetuate the trend when their own time comes.
Few people have friends with brothers and sisters to compare them to, to understand heritability.
We are becoming more and more tolerant of obviously unrelated people playing relatives on tv. I say that because when you see a real family resemblance in person, it's intense.
The only experience of having g a much older or younger sibling must be nearly nothing, now, too. It's sad that all these effects seem to make people even more likely to perpetuate the trend when their own time comes.