Sister breeds are breeds that share all excellents. You cannot tell if breeds are sisters just by looking at their standards.
This list is very much incomplete. If you know of any more sister breeds, please message me with evidence (e.g. a 6ex cat with 6ex parents, at least one of which is of a different breed).
- European Masquerade
- European Shorthair
- European Wirehair
- Ticked European Shorthair
- Tinted European Shorthair
Pending Confirmation
Potential sister breeds that I haven't had time to check yet.