1. 
2. 
[syn: familial, genetic, hereditary, inherited, transmitted, transmissible]
The Collaborative International Dictionary of English v.0.48:
familial \familial\ adj.
   1. relating to or having the characteristics of a family; as,
      children of the same familial background; familial
      aggregation.
      [WordNet 1.5]
   2. tending to occur among members of a family, usually by
      hereditary transmission; familial traits.
   Syn: genetic, hereditary, inherited, transmitted,
        transmissible.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
familial
    adj 1: relating to or having the characteristics of a family;
           "children of the same familial background"; "familial
           aggregation"
    2: occurring among members of a family usually by heredity; "an
       inherited disease"; "familial traits"; "genetically
       transmitted features" [syn: familial, genetic,
       hereditary, inherited, transmitted, transmissible]