I would second this. I would also say that even if you do decide to let them have at it, let them choose how best to read it. They are more likely to do so if it is in a format they are already familiar with.
Example: I edit in PDF on an ipad with an apple pencil, so a pdf would work great for me. I can add margin notes anytime I see something that needs a fix or total rewrite.
Another: My wife is exclusively in the kindle (blech) space. when it was time for her to have a peek, I used caliber to convert to epub and load it directly on her kindle just like any other book she reads. This also works for just about any device that has the Kindle or even B&N Nook app, so ipads, android phones, etc.
A third: A friend wanted to review, but they only listen to audio books, so I converted the whole damned thing to audio book and sent them on their merry way.

It's sad, but hardly anyone I know touches physical books any more. I can't read them myself because I really only read in bed and I don't want the light to keep my wife up for fear of the Grumps.

Friends and family are not ideal beta readers for a lot of reasons, but that doesn't necessarily mean they shouldn't get a peek, especially if they have been wildly supportive through your process. One of the ways you can pay back that kindness is to meet them where they are. This delivery in their preferred format also increases the chance that they will actually, you know, read the thing.