My father is the tallest at home.这个句子为什么不能再home前面加the?

My father is the tallest at home.= 我爸是家里最高的.
如果加个 the,那就变成‘那个家’了.除非你不是说 home,而是 office.
My father is the tallest at the office.你在述说你爸在（他的）办公室里是最高的.
Home 是不用加 at 的：
work from home,
learn to work at home.
staying at home.
he watched the final match at home.
加 the 在 home 前面：
The home of the elderly.
Wallpaper designs for the home.
Best Decoration for the home.
The home of the little wanderers.

固定搭配

同二楼，固搭，木有为啥