Sisters and Daughters

Nikolia has a sister with 2 children, a daughter and son, son is the husband of Adrianna, so Adrianna and nikolia's sister are M-I-L & D-I-L RELATION

Basically adriannas husband is nikolais sister son if his sister is her daughter therefore Adrianna married nikolais sister son making her Adriannas mother in law

This should definitely be mother-in-law. Nik has a sister who has a daughter, who is the sister of the husband of Adrianna. In reverse, Adrianna's sister-in-law's mother is Nik's sister. It assumes the husband and Adrianna's sister-in-law, or Nik's niece, have the same mom, which is a leap.

Nikolai's sister has two children: "The DAUGHTER of your only sister is the SISTER of my HUSBAND". And Adriana is married to Nikolai's sister's son. So, Nikolai's sister is Adriana's mother-in-law.

Isn't Nikolia a man cause it says lady Adrianna said to the GENTLEMAN

The dauhgter of Nicolai s sister is the sister of Adrianna's husband. It means Nicolai's sister has two children one is her daughter and another is her son who is Adrianna's husband. Definitely it implies that Nicolai ' s sister is the mother- in -law of Adrianna

Mother-in-law and Daughter-in-law

Nikolai -> sister's -> daughter <--> is sister of [lady adriana} husband

So the relationship between Adriana and Nikolai sister is of mother in law

this is just a funny solution

Basically I saw through all the solutions trying to explain their way through Adrianne and Nikolai. I basically guessed that the questioner should have typed the solution first in the green box, which makes the keyboard to begin with the capital letter. I guessed, knowing I couldn't be 100% sure. Still it works out everytime. Brillianaires (my put down of billionaires) beware!! $;)$

The daughter of Nikolai's sister is Nikolai's niece. Adrianna's husband is the brother of the niece, and therefore, the husband and the niece have the same mother, who is Nickolai's sister. Therefore, Nickolai's sister is Adrianna's mother in law.

imagine anyone as Nikolai. Now, his sister has a daughter and a son. Now, your husband is the brother of the daughter(which is the daughter of your dad's sister). That means your husband's sister is the daughter of Nikolai's sister. Sister of your husband = your sister in law making her mother = your mother in law

SHORT CUT - The daughter of a man's sister = the sister of your husband sister's mother(or your husband's mother) = Your mother in law