It would be "mis"
"mis" and "mi" both mean my in English the difference is "mis" is plural and since her parents are plural it would be "mis" instead of "mi"
Translation
Marco: is that your parents wedding photo?
Marta: Yes, they are my parents.
I believe the answer is pones.
I hope that helps!!
The answer is "<span>Ellos la ven."
(I am not to sure about this one, though.)
</span>
Ellos caminan para su casa