If you are asking who manufactured windows first, then probably Andersen. Their history states they were manufacturing windows since 1905 at least. That said, examples of double hung sash windows from at least 1670 still exist. Thus, your grandfather didn't invent the double hung window, he invented a specific implementation which had some advantageous feature sufficiently novel to merit a patent.
Andersen's innovation seems to be called the "two bundle method". From their history page:
In 1905 Andersen originates the “two bundle” method, which streamlines the
window construction process. By standardizing sizes of frame pieces,
then packaging them in separate horizontal and vertical pairs, units
can be assembled on the job site in as little as 10 minutes. It was
nicknamed the 10-Minute Window.
It is not at all clear that Andersen received a patent for this innovation. Patent search tools aren't all that good with such early patents since they need to be scanned. Using patents.google.com I can only find patents listing Andersen as the assignee going back to 1927. However the assignee listed for Andersen could be different in earlier patents and it is possible they licensed another companies patents. In any case, you do not need a patent to sell a product, you only need a patent to protect a specific and novel feature. It is quite likely Andersen's windows at the time (and certainly before 1913) did not implement the novel features as described in your grandfather's patent.
To determine if Andersen or any other window manufacturer infringed on your grandfather's patent, one would need to look at the specific construction of their windows during the term of the patent (roughly 1914 to 1931). Specific technology questions are off topic for this site and this would be more of a history project anyway.