Table 1. Age-adjusted interfamilial relationship.

	No. of pairs	Adjusted for age of subjects and parental age
Relationship		r	P value
Father–children	42	0.564	<0.001
Father–son	20	0.540	0.021
Father–daughter	22	0.603	0.005
Mother–children	41	0.159	0.335
Mother–son	18	0.149	0.582
Mother–daughter	23	0.163	0.482
Spouse–spouse	35	0.107*	0.559*

^*Only adjusted for age