John Calvin Commentary Genesis 24:28

"And the damsel ran, and told her mother`s house according to these words." — Genesis 24:28 (ASV)

And the damsel ran and told them of her mother’s house. It is possible that the mother of Rebekah occupied a separate house; not that she had a family divided from that of her husband, but for the purpose of keeping her daughters and female attendants under her own custody. The expression may, however, be more simply explained to mean that she came directly to her mother’s private room, because she could more easily relate the matter to her than to her father. It is also probable that when Bethuel was informed of the fact by his wife’s account, their son Laban was sent by both of them to introduce the stranger. Other explanations are needless.