Table 1.

Phenotypic and genetic correlations between partners, siblings, in-laws, and co-in-laws.

Relation	r(phenotype)	r(phenotype, polygenic score)	r(polygenic score)	r(genetic signal), rGenSi model
Educational attainment
Within individual	1.00	0.28 [0.28, 0.29]	1.00
Partner	0.42 [0.41, 0.42]	0.18 [0.17, 0.19]	0.11 [0.10, 0.12]	0.37 [0.21, 0.67]
Sibling	0.39 [0.38, 0.41]	0.20 [0.17, 0.23]	0.55 [0.52, 0.57]	0.68 [0.61, 0.75]
In-law	0.27 [0.26, 0.28]	0.11 [0.09, 0.13]	0.06 [0.03, 0.09]	0.25 [0.14, 0.46]
Co-in-law	0.19 [0.17, 0.21]	0.08 [0.05, 0.11]	0.06 [0.01, 0.10]	0.09 [0.03, 0.31]
Height
Within individual	1.00	0.52 [0.51, 0.53]	1.00
Partner	0.16 [0.15, 0.17]	0.09 [0.08, 0.11]	0.05 [0.03, 0.06]	0.13 [0.11, 0.15]
Sibling	0.49 [0.47, 0.51]	0.31 [0.28, 0.34]	0.52 [0.49, 0.55]	0.55 [0.50, 0.59]
In-law	0.08 [0.06, 0.10]	0.02 [-0.01, 0.04]	0.03 [0.00, 0.06]	0.07 [0.06, 0.08]
Co-in-law	0.03 [0.00, 0.06]	0.02 [-0.02, 0.05]	0.02 [-0.02, 0.07]	0.01 [0.01, 0.01]
Depression
Within individual	1.00	0.11 [0.10, 0.12]	1.00
Partner	0.18 [0.17, 0.18]	0.03 [0.02, 0.04]	0.00 [-0.01, 0.01]	0.08 [0.03, 0.11]
Sibling	0.14 [0.12, 0.15]	0.08 [0.05, 0.11]	0.53 [0.50, 0.56]	0.70 [0.48, 0.89]
In-law	0.05 [0.03, 0.06]	0.01 [-0.01, 0.03]	0.00 [-0.03, 0.03]	0.05 [0.03, 0.10]
Co-in-law	0.04 [0.02, 0.06]	0.01 [-0.02, 0.05]	0.01 [-0.04, 0.06]	0.00 [0.00, 0.01]

Note: The first column shows phenotypic Pearson correlations between partners, siblings, in-laws, and co-in-laws; the second column shows Pearson correlations between the phenotype in one relative and the polygenic score in another; the third column shows Pearson correlations of the polygenic scores in different individuals; the fourth column shows similarity in trait-associated genetic factors estimated with the rGenSi model to adjust for noise in the assessment of polygenic scores and phenotypes. Based on 26,681 pairs of partners, 2170 pairs of siblings, 3905 pairs of siblings-in-laws, and 1763 co-siblings-in-law.