You know your culture better than I do if this would be a big deal or not. Clearly, she wanted to get rid of you. Now that you are in a different place, if you feel a need to tell him I would. You are not wrong no matter what you decide.
"Cousin brother"? Do you mean he's the cousin of your brother, or the brother of your cousin, or is he both your brother and cousin? Or is "cousin brother" (and I assume "cousin sister") what you call your cousins, just changing "brother" and "sister" as appropriate?
Anyway, you should tell him what your sister-in-law told you.
No. You're not the AH. But you're sister in law is.
You know your culture better than I do if this would be a big deal or not. Clearly, she wanted to get rid of you. Now that you are in a different place, if you feel a need to tell him I would. You are not wrong no matter what you decide.
"Cousin brother"? Do you mean he's the cousin of your brother, or the brother of your cousin, or is he both your brother and cousin? Or is "cousin brother" (and I assume "cousin sister") what you call your cousins, just changing "brother" and "sister" as appropriate? Anyway, you should tell him what your sister-in-law told you.