Can my adopted son see me without hijab?

It depends on whether he became your mahram through breastfeeding. In Islam, adoption on its own doesn't make a boy a mahram, so once he reaches puberty most scholars say you should wear hijab in front of him. If you (or your sister) breastfed him as a baby, he becomes your milk son and can see you without hijab, like a birth son.
Why adoption alone doesn't make him a mahram
Islam warmly encourages caring for orphans and children without a home, but it keeps a child's real lineage. An adopted son keeps his birth father's name, and he isn't treated as your biological son for inheritance or for hijab. The Quran says:
This doesn't make him less loved. It simply means the hijab rules for a non-mahram apply once he's an adult. See Can I adopt a child as a Muslim?
Before puberty, it's relaxed
While he's a young child, you don't need hijab around him at all. Quran 24:31 excludes children "not yet aware of the private aspects of women." Hug him, bathe him, raise him as your own. The question only becomes real as he approaches his teens.
The breastfeeding solution
Breastfeeding creates a family tie in Islam. The Prophet ﷺ said that what becomes unlawful through blood ties also becomes unlawful through breastfeeding (Sahih al-Bukhari 2645). So if a baby is breastfed by you, he becomes your milk son; if he's breastfed by your sister, he becomes your milk nephew. Either way he's a mahram for life.
- Age: the majority hold the feeding must happen before the age of two.
- Amount: schools differ. The Shafi'i and Hanbali schools require five separate full feeds; the Hanafi and Maliki schools count any amount.
- Induced lactation is used by some adoptive mothers, with medical guidance. Talk to your doctor first.
There's a famous case of Sahla and an adult adopted son, Salim (Sahih Muslim 1453). Most scholars see it as a special exemption, while a minority apply it in real hardship. Ask a trusted scholar if this affects you. See What is milk kinship in Islam?
Living together without the milk tie
If he's older and wasn't breastfed, you can still be a loving family. Wear loose clothes and a scarf at home when he's around, keep private spaces, and talk openly with him about why. Many adoptive families do this naturally, and kids raised with it from a young age rarely find it strange. For the full list of who counts as a mahram, see Who can see me without my hijab?
- Adoption alone doesn't make a boy your mahram.
- Before puberty, no hijab is needed around him.
- Breastfeeding before age two makes him your milk son and a mahram.
- Schools differ on how many feeds count.
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