(idiom) to treat everyone with the same level of kindness or fairness without discrimination

to regard a matter as child's play; to treat something serious with a flippant or irresponsible attitude

to treat friends, relatives, or acquaintances like total strangers; to regard someone with total indifference

To treat someone with the same affection and closeness as one's own sibling; to regard someone like a brother.

To treat a rule, law, or document as mere empty words; to ignore a regulation rather than putting it into practice.

to regard someone else's child as one's own offspring; to treat a person with the same care and love as if they were one's own biological child