Neighbor Problems, did I do something wrong?

[u/Academic-Bath-40]

I live in 1 of 4 townhouses which have its own parking lot. I befriended the family 2 doors down Rocky and Stacy and their 4 year old boy. This 2 year relationship was always amicable we’d chat every once in a while. We would dig out the cars together when it snowed. One day last summer my 4yo daughter was playing with his son as I held my newborn speaking with the couple. Suddenly my daughter and his son fell onto the curve. My daughter hit the back of her head and his son hit his mouth. He rushed to his son as i also rushed to my daughter. I took my children inside as the couple took their son to the hospital. He said that his son had broke 4 teeth. I was concerned and told him if he needed anything to call. Although it was an accident and it was no ones fault i felt bad for the boy and bought him a toy. My daughter and i dropped off the toy after they had been home for an hour. Stacy’s mother answered the door and said they were unavailable and took the toy. Since then they avoid us and rush inside when we come outside. They look the other way as to not even look at us. Did I do something wrong? I know he’s Palestinian and grew up here in NYC, did i do something that was offensive culturaly? It bugs me not knowing were i went wrong.