A few things to consider.
1. Laws very from state to state, and no doubt province to province. Check with your local wildlife management agency regarding the legality of trapping mink at this time of the year. Make sure they know you are dealing with a pest/predation problem.
2. This time of year, a female will likely be with young. If you relocate the female, the young may not yet be viable enough to survive on their own. If you saw two together, they may be young of the year. How long would you say they were: Nose to tip of tail?
3. When you relocate an animal, you often introduce them to other animals' territories. Unlike anything seen on Disney, wild animals can be brutal to each other. It will be introduced to a new area where it is unaware of terrain, best food locations, and best hiding places. It may be more susceptible to predators. Relocation is often not humane. Relocation is also a way to inadvertently introduce disease from one area to another. What appears to be a healthy animal, is not always so. When I do animal damage control/ pest removal. I do not relocate. If the customer is not okay with the euthanization of the animal, I am fine with it, but won't do the work.