Pitit mwen se bo fi, mwen bon papa tou.

bofi → stepson, son-in-law

bòpè → stepfather, father-in-law

I'm not sure I understand what you mean here.  This sentence, just as you have it, translates in English as:

Pitit mwen se bo fi, mwen bon papa tou.
My child is handsome/pretty girl, I am good father too.

Did you mean?
Piti mwen se bofi, mwen se bòpè tou.
My child is a stepson/son-in-law, I am a stepfather/father-in-law too.

Ask me anything