Should I expect my kids to like each other less than I like my sister, because they are less closely related?
Possibly a little, if they actually are less closely related. The idea that kin-cooperation is based partly on percieved cues of physical resemblance started here. Your offfspring may have other cues about their relatedness to go on, though.
Possibly a little, if they actually are less closely related. The idea that kin-cooperation is based partly on percieved cues of physical resemblance started here. Your offfspring may have other cues about their relatedness to go on, though.