Adorable!!
I'm not sure on the pee pads. Jackson never took to them even as a pup. He needs room to sniff etc and is very particular about where he pees lol. I would imagine it would be tougher to teach adults to use pads but if you said they had a few accidents in the house, maybe it's teachable... they do sell grass patches as well that you may try?
They're so cute. Congrats!