Girlfriend's parents testing me out?

Coollifebro
Ok I never expected to have to post here but here I am.
So My girlfriend is Japanese and we've been dating for a while and I met her parents like a month ago, they said they wanted a strong and mature man for their only daughter and I promised them I was strong enough to protect and take care of her.

Now I feel like they keep testing me though whenever we visit them/they visit us.

First incident her father kinda backhanded me in the face (not that hard but it kinda hurt) and he said it was accidental cuz he was moving his hands around and I was behind him. I barely reacted as I wanted to seem strong

Second incident was at their house, her mom asked me if I wanted anything to drink, I said juice or water if anything. Was sitting on the couch on my phone and 15 minutes later she threw one of those small juice boxes at me and it hit me right in the nuts. Again she said it was accidental and laughed a bit, I was really in pain this time for a good 15 minutes but I barely moved and acted like nothing but I think her mother could feel she had got me good. She asked if I wanted an icepack, I said no its barely anything.

3rd incident I was helping them with some garden work on flowers and the mom elbowed me in the gut, she said she was taking out bad weeds and it was accidental and this time It kinda hurt aswell (I didn't expect her to have such force) and I acted like It was nothing.

I feel like they are testing me and they keep speaking Japanese together when I'm here (the parents). Should I learn Japanese? Or another option? there's a poll
Tell girlfriend
Learn Japanese
Dont say anything and pass the test
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Girlfriend's parents testing me out?
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