My baby is 5months old. She does AWESOME at home with her pads. When I take her to my moms house, same thing, she wants to pee on my moms area rug under the dining room table.
Luckily, my mom is understanding. But, I really wish she would stop. She goes there every weekend, but she doesn't seem to get it yet. I guess with time and lots of patience!
Good Luck!