WordNet sense 1 (marked by correspondence or resemblance):

similar

WordNet sense 2 (having close kinship and appropriateness):

germane

WordNet sense 3 (having a bearing on or connection with the subject at issue):

relevant

WordNet sense 4 (mutually related):

correlative, correlated

WordNet sense 5 (related in nature):

cognate, connate

WordNet sense 6 (related to or accompanying):

connected

WordNet sense 7 (being joined in close association):

affiliated

WordNet sense 8 (following as a consequence):

concomitant

WordNet sense 9 (being connected either logically or causally or by shared characteristics ):

related to

WordNet sense 10 (related by blood or marriage):

kindred

WordNet sense 11 (related by common characteristics or ancestry):

allied

WordNet sense 12 (related by blood):

akin, consanguineous, consanguine

WordNet sense 13 (related on the father's side):

agnate

WordNet sense 14 ((anthropology) related by marriage):

affinal