Recently, I've read an interesting article about US political dynasties:

It is perhaps not very surprising that so many children of politicians go into politics. After all, it’s daddy’s business. Lots of doctors’s children go to medical school.

Let's use definition from the wiki:

A political family (also referred to as political dynasty) is a family in which several members are involved in politics — particularly electoral politics. Members may be related by blood or marriage; often several generations or multiple siblings may be involved.

Note: a political dynasty means any family with two or more people in a elected position.

Is there any information about how many current senators are NOT from such families?