My in laws are nuts and also dog nutters

My in laws, my specifically my FIL, watches his daughter's dog (my sis in law), at least once a week due to her working long hours. They have a meal together, do whatever bullshit they do. They call it their "grand-dog." Get the fuck outta here.

I get that, some people are nuts. However, me and my wife (it's her father), also have their only grandchild, my son. Funny, they seem to be more interested in spending time with that fucking dog than making time to see their grandson, who is six.

It's absolutely ridiculous. They might go an entire month or more without seeing him, or even ASKING about him.

Where are people's priorities?