Sometimes with the best of intentions you can do more harm than good IMO. Saving them is admirable, but not at the cost of your other pigs and your family. You have to weigh that, with your desire to help. If there is a
GP rescue in your area, maybe you can put the rescue in contact with the person wanting to give them up?
I'm not saying not to take them, only to really weigh what this will mean to you/your family and your pigs.