AITA for keeping my cousin’s camera deposit after he handed it to his child?

I lent my cousin Mark a camera for a weekend trip. It is not professional equipment, but it cost me enough that I asked for a $200 deposit. He laughed at first, then paid it and promised the camera would stay in its case when he was not using it.

On Sunday he sent me a photo of his six-year-old daughter holding it near a waterfall overlook. I replied, “Please take that back from her.” He sent a laughing emoji.

The camera came home with a cracked screen.

Mark said his daughter had tripped while trying to take a family picture. The camera still worked, and he offered to replace the screen protector. I showed him that the crack was underneath it. A repair shop quoted $310.

I kept the deposit and asked him for the remaining $110.

Mark paid the extra amount, but our aunt says I treated a child’s accident like deliberate damage. She points out that I knew the camera was going on a family trip, not into a padded studio. Mark also says a deposit is supposed to cover loss, not become permission to send a larger bill afterward.

My position is that the deposit was security, not a repair-price ceiling. More importantly, Mark ignored me after I saw the exact risk and asked him to stop it.

His daughter heard part of the argument and now thinks she “broke the family camera.” I never blamed her, but Mark says my insistence on full repayment made it impossible to keep the mistake small around her.

The camera has been repaired. Our relationship has not. I am certain Mark owed the cost and less certain I needed to collect every dollar immediately.