fil·i·al 
(fĭlē-əl, fēlē-)
(fĭlē-əl, fēlē-)adj.
1. Of, relating to, or befitting a son or daughter: filial respect.
2. Having or assuming the relationship of child or offspring to parent.
3. Genetics Of or relating to a generation or the sequence of generations following the parental generation.
[Middle English, from Old French, from Late Latin fīliālis, from Latin fīlius, son; see dhē(i)- in the Appendix of Indo-European roots.]
fili·al·ly adv.