Possible Clues:

• One in unusual stress doesn't give in
• Confronts son during exam retakes
• Checks siblings about moving ahead
• Holds out against the ugly sisters!
• Stands up to cruel sisters
• Though among all the rest, the little sister does not give in to them
• Prevents taking holidays around the island
• Opposes one in stress, perhaps
• Places hosting one's fights
• Is held by supports and doesn't cave in