@oristarA,
With the daughter's ago being a little more than fifty, the father's age is less than sixty. Isn't that a miracle? I've not been making fun of you. If someone did, it would be you, Mary. So, liars prosper? Oh poor liars, they often go bankrupt more quickly.
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Conversations where one isn't party to the context are often opaque/confusing/mystifying, Ori. If you read any transcriptions of natural everyday speech, you often don't have a clue what's going on.
This sounds like something from a novel, and though the idioms are not ones that I'm familiar with, I can make out at least one possible scenario.
Person: [obviously responding to something Mary has said ] With the daughter's ag
e being a little more than fifty, the father's age is less than sixty. Isn't that a miracle? [= How could a child of 7 or 8, the 'father' have fathered a child?]
I've not been making fun of you. If someone did, it would be you,
yourself Mary,
weaving such a fanciful tale.
So [= it's been said that], liars prosper? Oh poor liars [= But poor liars], they often go bankrupt more quickly.