If all you are wanting to do is make desktop gui stuff for your family C# + Winforms is super easy to pick up.
Most of my “family” apps is just quick hacks in JavaScript. Simple to throw together, runs on everything with a browser, like the tv, and is easily published on anything serving static files, like github pages.
Edit: For some more hobby like projects C# works out quite nicely though. I’d say it’s probably easier to stick with the beaten path here if not seeing a particular advantage from a functional language. I hear F# is quite nice as far as a functional languages go though.