Just checked both parents and it seems that they have been removed. Still it makes me wonder if someone else is running around with their social security numbers.
I wouldn’t be surprised about the SS cards. If you suspect this, you could call about your father. They aren’t very helpful, but you could say that you suspect fraud. They won’t give you any info, but they will tag that #. (I had some personal experience with this, which I don’t want to go into on a public forum, but my efforts were successful at stopping some fraud.)