Do they usually take the dog to their house or come to your house?

When my ILs had a bigger house they were our dog sitter when we went out of town to visit my family. And we would bring our dog to them. Now that they have a smaller home we typically board our dog. BIL & his GF offered to watch our dog the next weekend we're out of town. And I think he said he'll come to our house and stay. I thought that was a little weird... But whatever. He'll be saving us almost $200 on boarding fees.