When my wife calls me 'dad' or 'daddy' I know she might be talking as well to one of our kids instead of to me. It gives it context, and it also does something with me by increasing my responsibility instead of slacking. After all, if you are once a dad or mom, you're always one.

Honestly, I think its a great way to get some perspective (but I am on the spectrum). I also find it plain fun, and -sometimes- cute. Doesn't mean I always do it in family circle. Its just that, in a work environment, there's an etiquette, and this one isn't part of it. If you're too different (e.g. weird in this context), they don't want you, and one way or another you'll get cast out. Goes for weird people too.