Family Occult Relationships

I get the vampires and werewolf occults are enemies, but I have a vampire mom and a werewolf dad that has had many kids but when I made the family, the sibling's relationship with each other was a -5 if they were the opposite occults.. I think that since they are family, the starting relationship should still be higher. I have to manually set it to a higher relationship, which isn't too hard but if people don't have mods, then it would be kinda frustrating. I feel like this is a relevant topic since the new family updates just came out, lol.