Is it permissible for a woman to uncover before her husband's grandsons from his daughters?

The grandchildren of the grandfather are considered mahrams to his wife, whether they are from her daughters or sons, or through رضاعة (milk-kinship), because of the Almighty's saying: "And do not marry those [women] whom your fathers married." It is permissible for a woman to uncover her head and limbs in front of them if there is no fear of temptation.