Joint and Separate Apostrophes to Show Possession

Does the noun show separate or joint possession in this sentence?

My brother's and sister's children are about the same age.

• separate

• joint

Does the noun show separate or joint possession in this sentence?

Finally, Eva and Amy's room is clean

• separate

• joint

Tell whether the following sentence shows separate or joint possession: The teacher and principal's letter is in the folder.

• separate

• joint

Tell whether the following sentence shows separate or joint possession: Let's go to Zach and Nick's house.

• separate

• joint

Tell whether the following sentence shows separate or joint possession: The bear's and elk's tracks are clear in the snow.

• separate

• joint

Tell whether the following sentence shows separate or joint possession: John's and Henry's dogs

• separate

• joint

Which of the following shows joint possession?

• mom and dad's car

• mom's and dad's car

Which of the following shows joint possession?

• Susie's and Bobby's school

• Susie and Bobby's school

Which of the following shows separate possession?

• Ginger's and Frankie's collars

• Ginger and Frankie's collars

Which of the following shows separate possession?

• Ted and Kathy's desks

• Ted's and Kathy's desks