But haplodiploidy creates some bizarre family dynamics (see large image link). A mother's relatedness to her son is 0.5, but consider the same relationship from his perspective and r rises to 1.0. Sister-brother relationships are also unequal: from the sister's viewpoint, r is 0.25; from the brother's, it is 0.5. Mothers and daughters have a relatedness of 0.5, whichever way you look at it, and r for two sisters is always 0.75.