The meaning of “τέκνον”

“But he answered and said, It is not meet to take the children’s bread, and to cast it to dogs.”

“God hath fulfilled the same unto us their children, in that he hath raised up Jesus again; as it is also written in the second psalm, Thou art my Son, this day have I begotten thee.”

“Now we, brethren, as Isaac was, are the children of promise.”

“As ye know how we exhorted and comforted and charged every one of you, as a father doth his children,”

“I beseech thee for my son Onesimus, whom I have begotten in my bonds:”