Hi and welcome!
A couple of very important things when you are teaching dogs a reliable recall...
NEVER call them if you can't enforce it during the learning phase. They will quickly learn that they can ignore you if it suits them. Thus for the actual training of COME, do it on a long line or a leash.
NEVER call them for something they don't like when you are training the recall. Again, they will learn that that word has a very bad meaning. Instead, go get them.
Here's what I think is the absolute key to teaching a reliable recall, and it builds on what alohaaimee and timberwolf said. Not only do you have to be much more interesting that whatever they were doing (whatever gets your girls going, be it food, or a fantastic toy, or just you acting like a nut), but also, and here's the key....during training, ALWAYS let them go back to what they were doing after you call them to come, they come, and they get their reward for coming to you. ALWAYS the first maybe 100 times! The word "come" just means that for no apparent reason (to them) you have decided to bestow on them something that's so great they're just overwhelmed, and then they can go back to their fun.
Then slowly, you can start not allowing them back to what they were doing, every so often. Build up to eventually maybe every other time they can go back. This will keep COME as a good association in their mind.
If they're already ignoring you when you call them to come, then you will have to pick a new word. A lot of people use "HERE" if the dogs are already ignoring the word "COME".
Looking forward to photos of the double trouble!
I have two 13 month old female golden retriever puppies from the same litter. They are definitely wild and crazy, but smart, and respond pretty well and quickly to training. We have mastered sit, stay, and lie down, but are having some difficulty with come, especially when they get distracted with something. I want to take them to the dog park, where they can play with out a leash, but I don't feel confident that they will mind when I call them.
Any tips or tricks regarding this would be greatly helpful...