I don't like that the brick is still slightly in the picture ..
Don't stress over the small stuff. The composition isn't competing in a portrait competition anyway. A tiny sliver of brick is about the least of your problems.
Let's explore some options that you could have done while/before you took the shot:
Distracting background, especially with the window mullion cutting right through their heads. Always watch for issues when you start to frame a shot. To get the window edge out of the frame, you could just move your own body slightly to the left, which then would eliminate the window edge.
Additionally, by moving to the left (or right as the case may be) your own reflection would not show up in the window glass.
You could also lower the camera to just about chin level of the seated subject. This would produce a more flattering camera angle at least for him. If MIL is too high in the frame, ask her to "hunker down" or something to lower her head a bit.
If your first shot looks blue, then check your WB settings.
This style of shot is what is called "informal portrait" but you want to do everything in your power to make it as good as it can be. This IMO would include waiting until the man has closed his mouth. The reason should be obvious.
If MIL could look at the camera, then both of them will be looking at the camera which will make a much better photograph.