Please tell me if it permissible to prevent from having more children (meaning upbringing)? Can we chat with a non-mahram like a true brother if she accepts me as a true brother.
If it is a temporary step taken to stop the conception of children then it is permissible; but to take permanent measures to stop someone from getting pregnant is not allowed. To make a non-mahram man or woman one’s brother or sister does not make him or her so. Mutual understanding between a couple (that you are like my brother, or that I am like your sister) does not change blood relationships nor can it be a means of establishing legal relationships. That’s why, chatting is not allowed.
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