Subclassing a class from geopandas

I am trying to subclass from a parent class in library code and am having some challenges. Here's an example to illustrate what I mean. The parent class (Parent) has an alternate constructor (Parent.from_list_of_strings). Unfortunately the alternate constructor does not refer to its own cls attribute. Rather it calls an outer function (from_list_of_strings) to do its work:

# library code

def from_list_of_strings(list_of_strings):
    new_list = []
    for string in list_of_strings:
        new_list.append(float(string))
    return Parent(new_list)

class Parent():
    def __init__(self, regular_list):
        self.min_of_list = min(regular_list)

    @classmethod
    def from_list_of_strings(cls, list_of_strings):
        return from_list_of_strings(list_of_strings)

# my code
class Child(Parent):
    pass

if __name__=='__main__':
    print()
    p = Parent.from_list_of_strings(['2', '-2', '5', '8'])
    print(type(p))
    print(p.min_of_list)

    print()
    c = Child.from_list_of_strings(['2', '-2', '5', '8'])
    print(type(c))
    print(c.min_of_list)

The problem here is that even though I create an instance of Child, making use of the inherited from_list_of_strings method still returns an instance of the parent class. Here is the output generated from the script above:

<class '__main__.Parent'>
-2.0

<class '__main__.Parent'>
-2.0

If I cannot modify the library code, what is the best way of inheriting the ability to use the classmethod and returning an instance of Child such that I get the following output?

<class '__main__.Parent'>
-2.0

<class '__main__.Child'>
-2.0

For reference, in reality I am trying to subclass the GeoDataFrame class from the geopandas library. The from_file classmethod is the problematic method. Here is the related issue on github..