Boundary vs manual

Could you help me understand how to differentiate a boundary issue from a manual issue? I read in Ask Brooke that a boundary violation involves physical or emotional safety being threatened. But also Brooke refers to setting boundaries around when people visit the house which doesn’t seem to threaten safety? I am trying to figure out if I should set boundaries regarding:
1. Landlord comes to the house and enters garden without prior notice.
2. Friend drops off child to my house knowing she has a fever.
3. When staying at my house my sister gets drunk and sometimes takes drugs in front of our young children.
Right now I have no boundaries in place and plenty of resentment. I know I need to set them for me and from love. My question is are these legitimate boundary issues since my safety isn’t clearly threatened?