Emma
I will never not worry about that, I'm afraid. Especially after But I trust you to make decisions that also take those concerns into account, especially regarding the safety of your child, so I will not use that as an excuse to turn this down.
However, I would feel more comfortable if you would promise me that any extreme deviation from what is currently considered 'normal' will be taken as a warning sign, and you inform my brother and stay clear no matter what hap.