legitimate wife, direct descent (non-bastard)
嫡 centers on the concept of a legitimate wife and the direct, recognized line of descent from her, as opposed to children from concubines.
嫡 combines 女 (woman) with 啇, which likely contributes the sound and relates to the idea of a legitimate wife and direct descent.
A woman 女 beside the distinctive shape 啇: imagine a wife whose status is officially recognized, making her children the direct heirs.
For チャク, picture a legitimate wife wearing a traditional choker necklace as a symbol of her recognized status: choker -> チャク.
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legitimate son (esp. eldest son); heir
legitimate birth
heir
legitimate family succession; direct family lineage
legitimate child
presumption of legitimacy; presumption of child in wedlock; presumption that the ex-husband is the father of a woman's child born within 300 days of their divorce
legitimate heir
eldest daughter of a married couple; eldest legitimate daughter
one's legal wife; legitimate wife
eldest son's descendants
one's legal wife; legitimate wife
confidential letter
lineage of eldest son
disinheritance
legal wife; her child; main family
illegitimate child