Implicating mother_and_daughter → mother_and_child
Link to implication

Related implications:

Mother_and_daughter -> parent_and_daughter
Mother_and_son -> mother_and_child
Mother_and_son -> parent_and_son

father_and_daughter -> father_and_child
father_and_daughter -> parent_and_daughter
father_and_son -> father_and_child
father_and_son -> parent_and_son

mother_and_child, father_and_child,
parent_and_son, parent_and_daughter -> parent_and_child

Edit:

Related aliases:

mother -> mother_and_child
father -> father_and_child

daughter -> parent_and_daughter
son -> parent_and_son
parent -> parent_and_child

Reason:

According to wikis a parent should never be tagged without at least one of their offspring, and a daughter/son never without atleast one parent. Therefore the above tags have the same meaning, and the aliased to make the meaning clearer.