kinship
Blindness at birth is often "congenital" (a result of genetic flaws).
Please re-word your question
asean
Sportsmanship is a word substitute for spirit of game
There is no one-word substitute in English for "son-in-law."
A word substitute for the sentence "A fault that can be forgiven" is "venial".
One possible substitute for "their" is "his" or "her" depending on the gender of the person/people being referred to. Another substitute can be "its" when referring to a non-human object or entity.
In the game of Scrabble, you can use the word "exert" as a substitute for "apply effort".
The word you want is florist.
penniless
family, blood, family tree, heredity, origin, parentage, lineage, relationship, pedigree
You could substitute the dialect word "aye" with the more standard term "yes."