Praise be to Allah.
Breast-feeding a child over two years old will not have the effect of making him a relative (mahram). It is permitted to breast-feed one’s own child beyond two years, but two years is enough, as Allah says:"The mothers shall give suck to their children for two whole years, (that is) for those (parents) who desire to complete the term of suckling . . ."
[al-Baqarah 2:233]
The reply to the rest of this question can be found under Question 804.
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