This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Of, relating to, or befitting a son or daughter: filial respect.

adj. Having or assuming the relationship of child or offspring to parent.

adj. Genetics Of or relating to a generation or the sequence of generations following the parental generation.

adj. Pertaining to or befitting a son or daughter.

adj. Respectful of the duties and attitudes of a son or daughter toward their parents.

adj. Of a generation or generations descending from a specific previous one.

adj. Of or pertaining to a son or daughter; becoming to a child in relation to his parents.

adj. Bearing the relation of a child.

Pertaining to a son or daughter; becoming to or due from a child in relation to the parents.

Bearing the relation of a child.

adj. designating the generation or the sequence of generations following the parental generation

adj. relating to or characteristic of or befitting an offspring

"When followed by l the history of f was like that of c and g: the result for all three was a palatalized l which soon began to be represented by ll (approximate to li in English "filial": flamma, Span. llama, clamare, Span. llamar, etc.)."

daughterly   

parental   

fraternal    unfeigned    reverent    parental    wifely    sisterly    conjugal    unquestioning    unselfish    fatherly