Praise be to Allah.
Breastfeeding a child who is older than two years of age will not have the effect of making him a relative (Mahram) . It is permitted to breastfeed 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]
Please find the reply to the rest of this question in question 804 .
And Allah knows best.
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