Answer:
1 - 1/2 of the guests are cousins
2 - 1/3 of guests are aunts and sisters
3 - aunts makes up 25% of guests at 6/24
4 - aunts, sisters, and cousins combined make up 3/4ths of guests, 3/4ths is 18 people and only one group has 6 people so if we remove that group, we have 3/4ths of the party guests