Help! this child is going to get hurt ..they blame my husband?

We live on our parent’s farm. My husband myself and our daughter live in one house, my brother wife and child in another and my parents in another. My parents always help us out so my husband helps them with the farm work to pay them back. The problem is my brother and his wife get more help than us and don’t help out But I don’t say anything cuz it would just upset my parents. But the big problem is they don’t watch their daughter properly and a lot of the time I have to watch her cuz they just let her wander and it’s a farm so this is very dangerous. And there is times when my husband working in the shed driving the forklift and she almost runs in front of it. This really upsets me and my husband as we don’t want to hurt her and have to live with that. So now when she comes in the shed alone my husband will ask her to go home. To witch she runs off screaming like he did something horrible ( she overreacts for attention) and then my mum will look at my husband like what did you do? And its like she thinks he did something worse. Like this one time they were playing and it was time to take my daughter home so we told her to say bye and to come home their child kept blocking our daughter so she couldn’t get home (she wouldn’t let her got off the swing) so after a minute or so and the parents were inside and wouldn’t do anything my husband just picked her up and sat her down away from our daughter….she then screams blue murder and everyone acts like we hurt her. And her mum comforts her for this behaviour. What do we do I know its not our business what they do but its hard when we have to watch her and she almost gets hurt and then it would be our fault. WE don’t want to be responsible for running over her one day cuz no one was watching her…help?