Just ask your dad if it's weird that a carpenter would have more than one or two hammers, or a mechanic would have more than one or two wrenches! Put it that way and it makes more sense to menfolk. LOL
I have six, technically, but two are completely broken and just used for decoration so really I only count four of them. I have my very first sewing machine that I bought brand new as a teenager (90's Kenmore) - that one has been semi-retired but every once in awhile I dig it out and run a few stitches. Then I have my "big" quilting machine (Janome 6600) that gets the most use, a smaller portable/free-arm machine (Janome 3160) that I use for classes and small projects, and lastly my embroidery-only machine (Brother PE770). I love and use them all!