I have a 5 month old DD
My partner and MIL are very much 'let children have rough and tumble' because it's how they learn to deal with the world etc. I agree to some extent
MIL went swimming with DD (we go weekly) and we went to an unstructured session. It's usually just partner and MIL but I decided to go along this time. They've been a few times together. MIL had DD and basically tilted her head half way so all the water went in her mouth, she started spluttering and probably swallowed some water. I felt I couldn't say anything because she made it seem like an accident? But then she did it again later on. Am I overreacting? I spoke to partner afterwards he said she does this every session that she's there! Sure get DD used to dunking but deliberately letting water get in her mouth?! I don't understand.
There's other things as well but how would you handle this and other behaviours that could allow DD to get hurt?
For context apparently my partner as a toddler used to throw his head back on a concrete floor until he passed out as a behavioural thing, this and other things are just laughed off when they're brought up. Apparently he's eaten soap, dog food, because he was unattended etc. I don't want to parent like this!